Linkage to care is a crucial early step in successful HIV treatment and is typically defined as the completion of a first medical clinic visit after an HIV diagnosis. Linkage to care plays a crucial role in the HIV care continuum because it is a necessary precursor to retention in care, antiretroviral therapy initiation, and viral suppression. Evidence clearly demonstrates that antiretroviral treatment significantly reduces the risk of developing HIV-related complications and the risk of death.[1,2,3,4] In addition, antiretroviral therapy dramatically reduces HIV transmission to others.[5,6] Without timely entry into care, individuals with HIV infection miss an opportunity to benefit from HIV treatment at the earliest stage feasible; linkage to care within 3 months significantly increases the likelihood of achieving viral suppression.[7] Delayed linkage to care also is a major barrier to the potential for “treatment as prevention” to reduce HIV transmission rates in the United States. Thus, identifying persons with HIV infection and successfully linking them to care plays a critical role in the overall HIV epidemic, both from a treatment and a prevention standpoint (Figure 1). This following provides a review of the current state of linkage to care in the United States, examines barriers to linkage to care, and explores future opportunities for improving engagement in care.
- Section 1 Overview
Screening and Diagnosis - 0%Topic 1
Epidemiology of HIVActivities- 0%Topic 2
HIV Screening RecommendationsActivities- 0%Topic 3
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Acute and Recent HIV InfectionTopic 5. Linkage to HIV Care
Learning Objective Performance Indicators
- Describe strategies for optimizing linkage to care for persons newly diagnosed with HIV in the United States
- Identify barriers for persons newly diagnosed with HIV infection linking to care
- List the metrics used to estimate and monitor linkages to care
- Discuss strategies for linking HIV-negative individuals for preexposure prophylaxis (PrEP), as clinically indicated
Last Updated: July 17th, 2017Authors:Julie Dombrowski, MD, MPH,Julie Dombrowski, MD, MPH
Associate Professor of Medicine
Division of Infectious Diseases
University of Washington
Deputy Director for Clinical Services
HIV/STD Program
Public Health - Seattle & King CountyRebecca G. Kinney, MDRebecca G. Kinney, MD, MSc
Chief Medical Officer
ParsylDisclosures: NoneReviewer:Susa Coffey, MDSusa Coffey, MD
Professor of Medicine
University of California, San Francisco
Medical Editor
AETC National Coordinating Resource CenterDisclosures: NoneTable of ContentsBackground
Process for Estimating and Monitoring Linkage to Care
Metrics Used for Estimating Linkage to Care
In the United States, the recently established federal benchmark for successful linkage to care is completion of a visit with an HIV medical provider within 1 month (30 days) of HIV diagnosis.[8] The Centers for Disease Control and Prevention (CDC) monitors linkage to care after HIV diagnosis for two timeframes—within 1 month (30 days) and within 3 months (90 days).[9] The CDC surveillance data are based on documentation of an HIV RNA level (viral load) or CD4 cell count within 1 month or 3 months of diagnosis as evidence for linkage to care.[9] From a practical standpoint, the laboratory HIV RNA or CD4 cell count test results serve as an easily measurable surrogate marker for a clinic visit for HIV medical care. Most published population-based studies have defined linkage to care as having at least one CD4 count or HIV RNA level (viral load) report within 3 months of HIV diagnosis based on the federal benchmark prior to 2015. Using the standard metric for linkage to care, a first visit more than 1 month (or 3 months if using older criteria) after HIV diagnosis is considered “failed linkage” or “delayed entry into care”. Linkage to care is considered a one-time event, whereas retention in care reflects ongoing engagement or reengagement in care. The start of antiretroviral therapy is not part of the definition of linkage to care in the United States, although this is a key part of the UNAIDS “90-90-90” goals for the HIV care continuum worldwide.
HIV Case and Laboratory Surveillance
In areas where laboratory-based reporting of HIV RNA (viral load) and CD4 cell count results is mandated by law, state and local health departments and the CDC use this information to monitor linkage to care. As of March 2015, 41 states and the District of Columbia required reporting of all CD4 and viral load test results.[10] The HIV surveillance programs within state and local health departments also collect sociodemographic data and are able to track differences among risk groups and among jurisdictions, thus providing an opportunity to develop HIV interventions that are appropriate at the local level.[11] HIV surveillance data has the important advantage of being population-based. Surveillance integrates data across care sites and includes more than 80% of persons living with HIV in the United States.[9,12]
Medical Monitoring Project
A supplemental surveillance project, the Medical Monitoring Project (launched by the CDC in 2005), was designed to collect data from a nationally representative sample of adults receiving care for HIV. It collects data on health care reform, such as access to and sources of health coverage, unmet needs for mental health, substance use, and supportive services. The Medical Monitoring Project data reflect the experience of individuals with HIV infection who are in care, including services provided by different payers (Medicaid, Medicare, Ryan White Program), but have been limited by low participant response rates and, prior to 2014, did not include out-of-care persons.[13] In 2014, the CDC adopted a new methodology using surveillance data for sampling adults with HIV infection with the goal of including persons at all steps in the HIV care continuum after diagnosis, including those who are out of care.
Current State of Linkage to Care in the United States
Estimates of Successful Linkage to Care in United States
Based on data from the 33 jurisdictions that reported complete CD4 and HIV RNA laboratory values to CDC for 27,281 persons diagnosed with HIV infection in 2014, 74.5% were linked to HIV medical care within 1 month after the HIV diagnosis, and 84.0% were linked within 3 months of the HIV diagnosis.[9] From 2010 to 2014, the percentage of persons linked to care within 1 month or 3 months increased steadily (Figure 2).[9] These recent CDC linkage data for the United States show a major improvement from earlier studies that estimated only 59 to 66% of persons newly diagnosed with HIV infection were linked to clinical HIV care within 3 months.[1,14,15] In response to the persistent gaps in the HIV care continuum, efforts have intensified to focus and coordinate resources to improve the HIV care continuum, including linkage to care. The United States federal benchmark linkage to care goal is for at least 85% of persons to be linked to HIV medical care within 30 days of HIV diagnosis.[8] Researchers are increasingly finding that estimates of engagement in care along the entire HIV continuum need ongoing refinement through better HIV surveillance data, with the expectation that estimates of linkage may continue to evolve.[16,17]
Risk Factors for Delayed Linkage to Care
Multiple studies have consistently identified risk factors that predict delayed linkage to care: poverty, housing insecurity, lack of insurance or access to primary care prior to HIV diagnosis, substance use disorders, and mental illness.[16,18,19,20,21,22,23] The CDC Surveillance Report based on 2014 data shows disparities in linkage to care at both 1 month (Figure 3) and 3 months (Figure 4) among non-Hispanic blacks and Hispanics compared to non-Hispanic whites.[9] These same data show higher rates of linkage with older age at the time of diagnosis (Figure 5), and slightly higher rates of linkage with women than men (Figure 6).[9] A 2013 analysis for linkage to care in women diagnosed with HIV found higher linkage rates among pregnant women than non-pregnant women.[24] Additional risk factors for delayed linkage to care include psychosocial, emotional, and structural barriers. A 2009 national survey conducted to assess perceived barriers to HIV testing, care, and treatment revealed that healthcare providers more often attributed non-engagement in care to structural barriers (finances, transportation, family care, lack of time off from work, and substance use) whereas patients more often reported psychosocial issues (fear of people knowing their diagnosis, concern about medication side effects, stigma, and shame) as the most important barriers to care.[25] Other barriers, such as inconveniently located medical services, long appointment wait times, and language barriers, also likely contribute to delayed linkage to care. Persons who are required to undergo HIV testing, such as for insurance, employment, or court-ordered purposes, have been found to delay linkage after receiving a diagnosis of HIV, compared with individuals who self-initiate testing or have HIV testing recommended by their medical provider.[26]
Linkage Based on Site of Testing
In a study from New York City involving persons diagnosed with HIV in 2003, investigators reported that persons undergoing routine HIV testing many non-primary care settings, such as sexually transmitted disease clinics, correctional facilities, or community testing sites, are less likely to be linked to care than those who are diagnosed at a site that offers co-located primary medical care (Figure 7).[20] In these settings, improvements in linkage can occur as shown by follow-up data from New York City that showed a steady increase in rates of linkage to care from 2006 to 2014.[27] Studies have highly variable rates of linkage to care following a diagnosis of HIV when testing is performed in an emergency department setting.[28,29,30] One review of 31 articles related to HIV testing in the emergency department setting found an overall linkage to care rate of 74%, with higher linkage rates associated with emergency departments that had intensive linkage to care programs.[30] Although the optimal approach to testing for HIV in a busy emergency department setting remains uncertain, studies have identified strategies to improve linkage to care from the emergency department. For example, a retrospective study of rapid HIV testing in the San Francisco General Hospital emergency department showed that more than 90% of patients were successfully linked to care by a dedicated linkage team from the hospital's associated HIV clinic.[31]
Interventions to Improve Linkage to Care
Although a multitude of barriers to HIV care have been identified, few randomized controlled trials have evaluated interventions to overcome these barriers. Moreover, published studies that have evaluated linkage to care interventions have not used standardized outcomes, making comparisons between studies problematic.[32]
Expert Panel Recommendations
In 2015, an expert panel from the International Association of Physicians in AIDS Care published evidence-based recommendations for improving the HIV care continuum.[33] The following summarizes four key panel recommendations for improving linkage to care:
- Immediate referral to HIV care is recommended following an HIV diagnosis to improve linkage to antiretroviral therapy.
- Use of case managers and patient navigators to increase linkage to care is recommended.
- Proactive engagement and reengagement of patients who miss clinic appointments and/or are lost to follow-up, including intensive outreach for those not engaged in care within 1 month of a new HIV diagnosis, is recommended.
a. Case management to retain person living with HIV in care and to locate and reengage patients lost to follow-up is recommended.
b. Transportation support for persons living with HIV to attend their clinic visits is recommended.
Monitoring Linkage to Care
Monitoring linkage to care provides data essential to the development, tracking, and evaluation of cost-effective linkage interventions. The responsibility for ensuring successful entry into HIV care primarily falls on the medical provider (or another staff member) at the site where the diagnosis of HIV is made, although local health departments and HIV clinics would ideally also be involved in this process. It is incumbent upon each local community to define roles and accountability for the linkage to care process. Integrating data and surveillance systems also is important in coordinating linkage to care. It is important to recognize that linkage to care does not ensure retention in care, and clinics and health departments should also develop systems to maximize retention in care.
Strengths-Based Case Management
Strengths-based case management is one of the few interventions that have been studied rigorously. Strengths-based case management employs the technique of asking individuals to identify their internal strengths and skills in order to attain needed resources such as medical coverage, transportation to appointments, housing, mental health treatment, or addiction treatment. The ARTAS and ARTAS-II studies, taken together, showed increased rates of linkage to care with intensive strengths-based case management compared to standard procedures (78 to 79% versus 60% within 6 months); this led to the recommendation to use strengths-based case management for improving linkage to care. The primary barrier to widespread implementation of the findings from ARTAS is that the intervention is relatively resource intensive.
- ARTAS: The Antiretroviral Treatment Access Study (ARTAS) was a randomized controlled trial in 11 United States cities that examined the impact of strengths-based case management on linkage to care rates.[34] Investigators randomized individuals with recently diagnosed HIV infection to receive either standard of care passive referral (patients were given information about HIV and local resources) or intensive case management support with linkage to nearby HIV clinics. Intensive case management consisted of up to 5 contacts over 90 days with a case manager who emphasized strengths-based techniques). Strengths-based case management employs the technique of asking individuals to identify their internal strengths and skills in order to attain needed resources that may include medical coverage, transportation to appointments, housing, mental health treatment, or addiction treatment. The results of the study showed the intensive management group had significantly higher rates of receiving HIV care within 6 months compared with the standard of care group (78% versus 60%).
- ARTAS-II: In a follow-up non-randomized study, ARTAS-II, all persons recently diagnosed with HIV received case management (up to 5 contacts).[35] Of the individuals newly diagnosed with HIV, 79% received HIV clinical care within 6 months of enrolling in the study.
Intensive Outreach
The important role for early and intensive outreach efforts was demonstrated in the U.S. Special Projects of National Significance (SPNS) Outreach Initiative, a 5-year initiative to enhance service delivery strategies to engage and retain persons living with HIV in HIV primary medical care. This program consisted of non-randomized interventions at 10 urban areas across the United States and implemented various combinations of strategies. Most interventions included components of outreach and support services in different forms, such as appointment reminders, health system navigation, health literacy training, and provision of food and transportation. Inclusion criteria and program staff training varied by site.[36] All sites focused on individuals considered to be underserved or marginalized by the health care system (such as women, youth, and people with a history of substance use or mental illness); each newly diagnosed person living with HIV received an average of 19 contacts over 12 months, with an average contact time of 15 minutes per contact. Within 6 months of enrollment, 92% of newly diagnosed study participants attended medical appointments, rates of virologic suppression in the study population improved from 14% at baseline to 45% after 12 months of follow-up, and participants reported an overall reduction in structural, financial, and personal barriers to care.[37]
Patient Navigators
Persons living with HIV infection are often uniquely qualified to assist individuals newly diagnosed with HIV infection as they try and navigate the healthcare system; trained peers (individuals with established HIV infection) often have shared characteristics and circumstances as well as direct disease-relevant experience and knowledge of local community strengths, challenges, and resources.[38] The California Bridge Project concluded that the characteristics of the persons responsible for recruiting and linking the patient to HIV care strongly influenced the success of linkage to care efforts, with the highest success rates occurring when the staff member and client had similar social and cultural backgrounds.[39] Navigators are concerned with the individual patient rather than the health care system as a whole.[40] Although acceptance of the patient navigator model is widespread, there is little empiric evidence that this intervention is effective. No controlled studies of peer navigators have been published.
HIV Partner Services
The term “HIV partner services” encompasses a variety of services that health departments may offer to persons newly diagnosed with HIV and to their sex and needle-sharing partners.[41,42,43] An important goal of partner services is to detect previously undiagnosed HIV infections and prevent further HIV transmission by helping persons newly diagnosed with HIV to notify their partners and to connect the partners with testing services. Partner services can also assist in linking these individuals newly diagnosed with HIV, as well as any newly diagnosed partners, to HIV medical care. Health departments across the U.S. vary widely in the extent to which they conduct HIV partner services, but they are increasingly using surveillance data to guide partner services and increasingly include linkage to care as a key goal. No controlled studies have been conducted, but health departments have reported improved rates of linkage to care after implementation of public health partner services.[41] The Centers for Disease Control and Prevention (CDC) promotes the use of HIV partner services to improve linkage to care.
Financial Incentives
Use of financial incentives for linkage to care was studied as a component of HPTN-065 (“TLC-Plus”), a feasibility study evaluating an enhanced testing, linkage to care, and treatment strategy in the United States. The Linkage to Care component of the study was a randomized intervention involving 37 HIV test sites (18 in Bronx, NY and 19 in Washington D.C.) to determine whether financial incentives (gift cards) improved linkage to care. Results presented in 2015 showed that financial incentives did not increase linkage to care; interestingly, though, financial incentives did improve overall continuity of care by 8% and improved rates of viral suppression in certain clinical settings.[44] Results from the viral suppression component of the study indicate that most patients found the use of financial incentives to be acceptable and validating.[45]
Strategies for Clinics to Improve Linkage to Care
Clinics that provide HIV clinical care can also play a role to ensure that successful linkage to care occurs and to improve the likelihood that patients will engage in continuous HIV care. Although there are few published, evidence-based interventions in this area, examining the “best practices” of HIV clinics yields several suggestions. In addition, the CDC maintains an online Compendium of Evidence-Based Interventions and Best Practices for HIV Prevention that includes information on best practices in promoting linkage to, retention in, and re-engagement in care.[46]
Shorten Wait Times for Initial Appointment
Very short wait time for new patient visits may increase the likelihood of appointment completion. In a study at the University of Alabama at Birmingham (UAB) 1917 Clinic, among patients who called to establish HIV care from 2004 to 2006, 31% failed to attend a clinic visit within 6 months of their initial call.[47] To address this problem, the UAB 1917 Clinic launched Project CONNECT (Client-Oriented New Patient Navigation to Encourage Connection to Treatment), which established a clinic standard of scheduling an intake and orientation appointment for all new patients within 5 days of initial request for a new appointment.[48] The orientation visit includes an intake questionnaire, baseline laboratory testing, case manager visit, initiation of opportunistic infection prophylactic medication if needed, and mental health and substance abuse referrals when indicated. The initial visit no-show rate decreased from 31% at baseline to 19% after the implementation of Project CONNECT. The cost of this systems-level intervention was $200 per patient, which translated to $1628 per additional patient linked to care; this was considered a reasonable expenditure.
Follow-up After Missed Initial Appointment
Calling or otherwise conducting outreach to follow up with patients who do not show up for their first scheduled HIV care visit should ideally be part of an HIV clinic protocol. Certain patient characteristics have been associated with higher “no-show” rates, including minority race/ethnicity (especially minority women) and having public health insurance or no health insurance.[48] Specific strategies, such as improving the initial clinic orientation process, implementing reminder phone calls, using peer navigators, and accompanying patients to medical appointments should be implemented at the clinic level to engage populations at risk for higher no-show rates.[49]
Retention in Care
Linkage to sustained care, but not linkage to initial care, has been significantly associated with subsequent virologic suppression and survival, and patients who miss visits in the first year after initiating HIV medical care have more than twice the rate of long-term mortality compared with patients who attend all of their scheduled clinic appointments.[50,51] Many of the strategies that have been proven to help with linkage to care apply to retention in care as well; in particular, clinics providing HIV care should address barriers to care such as transportation problems, unstable housing, substance abuse, and mental illness, and clinics should consider longitudinal programs that can continuously engage patients who fall in and out of care. Nonetheless, despite the overlap, linkage to care and retention in care are distinct processes. Retention in care is discussed in detail in Module 2.
Summary Points
- Linkage to care is the first step in engaging in HIV care and is typically defined as the completion of a first medical clinic visit after an HIV diagnosis.
- The benchmark for successful linkage to HIV care is completion of a visit with an HIV medical provider within 1 month after HIV diagnosis, though reporting still occurs for linkage within 3 months. The United States national goal for linkage to care is 85% within 1 month.
- The CDC estimates that approximately 75% of persons were linked to care within 1 month of HIV diagnosis and 84% were linked within 3 months.
- Key risk factors for delayed linkage include lack of insurance and primary care prior to HIV diagnosis, substance abuse, residence in a high poverty area.
- Linkage to care is lower among non-Hispanic black/African-American and Hispanics compared to non-Hispanic whites.
- Ensuring linkage to care is a crucial part of any HIV testing program. Active assistance with arranging care linkage is more effective than passive referral to care.
- The Antiretroviral Treatment Access Study (ARTAS) intervention, which includes multiple sessions of strengths-based counseling, is an evidence-based linkage to care model.
- Assisting persons with linkage to HIV care is a primary goal of public health HIV partner services.
- HIV clinical programs can increase rates of linkage to care by shortening their wait times for new patient visits, conducting outreach to persons who no-show to their first scheduled visit, and conducting case management intake for new patients prior to the HIV medical provider visit.
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- Mugavero MJ, Westfall AO, Zinski A, et al. Measuring retention in HIV care: the elusive gold standard. J Acquir Immune Defic Syndr. 2012;61:574-80.[PubMed Abstract] -
- Naar-King S, Bradford J, Coleman S, Green-Jones M, Cabral H, Tobias C. Retention in care of persons newly diagnosed with HIV: outcomes of the Outreach Initiative. AIDS Patient Care STDS. 2007;21 Suppl 1:S40-8.[PubMed Abstract] -
- Schrantz SJ, Babcock CA, Theodosis C, et al. A targeted, conventional assay, emergency department HIV testing program integrated with existing clinical procedures. Ann Emerg Med. 2011;58:S85-8.e1.[PubMed Abstract] -
- Thompson MA, Mugavero MJ, Amico R, et al. Guidelines for improving entry into and retention in care and antiretroviral adherence for persons with HIV: evidence-based recommendations from an International Association of Physicians in AIDS Care panel. Ann Intern Med. 2012;156:817-33.[PubMed Abstract] -
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Figures
Figure 2. Linkage to Care Within 1 Month or 3 Months of HIV Diagnosis, 2010-2014Sources: (1) Centers for Disease Control and Prevention. Monitoring selected national HIV prevention and care objectives by using HIV surveillance data--United States and 6 U.S. dependent areas, 2014. HIV Surveillance Supplemental Report. 2016;21(No. 4):1-87. Published July 2016. (2) Centers for Disease Control and Prevention. National HIV Prevention Progress Report, 2015.Figure 3. Linkage to Care Within 1 Month of HIV Diagnosis, by Ethnicity/Race, 2014Source: Centers for Disease Control and Prevention. Monitoring selected national HIV prevention and care objectives by using HIV surveillance data--United States and 6 U.S. dependent areas, 2014. HIV Surveillance Supplemental Report. 2016;21(No. 4):1-87. Published July 2016.Figure 4. Linkage to Care Within 3 Months of HIV Diagnosis, by Ethnicity/Race, 2014Source: Centers for Disease Control and Prevention. Monitoring selected national HIV prevention and care objectives by using HIV surveillance data--United States and 6 U.S. dependent areas, 2014. HIV Surveillance Supplemental Report. 2016;21(No. 4):1-87. Published July 2016.Figure 5. Linkage to Care Within 1 Month or 3 Months of HIV Diagnosis, by Age, 2014Source: Centers for Disease Control and Prevention. Monitoring selected national HIV prevention and care objectives by using HIV surveillance data--United States and 6 U.S. dependent areas, 2014. HIV Surveillance Supplemental Report. 2016;21(No. 4):1-87. Published July 2016.Figure 6. Linkage to Care Within 1 Month or 3 Months of HIV Diagnosis, by Sex, 2014Source: Centers for Disease Control and Prevention. Monitoring selected national HIV prevention and care objectives by using HIV surveillance data--United States and 6 U.S. dependent areas, 2014. HIV Surveillance Supplemental Report. 2016;21(No. 4):1-87. Published July 2016.Figure 7. Risk factors for Delayed Linkage to Medical Care after HIV Diagnosis, New York CityThis graphic shows difference in rates of delayed linkage to care (linkage after 3 months) based on site of HIV diagnosis in New York City in 2003.Source: Torian LV, Wiewel EW, Liu KL, Sackoff JE, Frieden TR. Risk factors for delayed initiation of medical care after diagnosis of human immunodeficiency virus. Arch Intern Med. 2008;168:1181-7.Share by e-mail
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