Antiretroviral Guidelines

US DHHS Guidelines with Australian commentary


Laboratory Testing for Initial Assessment and Monitoring of Patients with HIV Receiving Antiretroviral Therapy


Last Updated: October 25, 2018; Last Reviewed: October 25, 2018

AU comment: IGRA Testing

AU comment: Baseline chest x-ray

Laboratory Testing Schedule for Monitoring Patients with HIV Before and After Initiation of Antiretroviral Therapy


Laboratory Test Timepoint or Frequency of Testing
Entry into Care ART Initiationb or Modification 2 to 8 Weeks After ART Initiation or Modification Every 3 to 6 Months Every 6 Months Every 12 Months Treatment Failure Clinically Indicated If ART Initiation is Delayedc
HIV Serology

If HIV diagnosis has not been confirmed

CD4 Count

During first 2 years of ART, or if viremia develops while patient is on ART, or CD4 count <300 cells/mm3


After 2 Years on ART with Consistently Suppressed Viral Load:
CD4 Count 300–500 Cells/mm3:

  • Every 12 months

CD4 Count >500 Cells/mm 3:

  • CD4 monitoring is optional

Every 3–6 months

HIV Viral Load d e e Repeat testing is optional.
Resistance Testing f f
HLA-B*5701 Testing

If considering ABC

Tropism Testing

If considering a CCR5 antagonist

If considering a CCR5 antagonist, or for patients experiencing virologic failure on a CCR5 antagonist-based regimen

Hepatitis B Serology

(HBsAb, HBsAg, HBcAb total) g,h,i

May repeat if patient is nonimmune and does not have chronic HBV infectionh

May repeat if patient is nonimmune and does not have chronic HBV infectionh

Including prior to starting HCV DAA (see HCV/HIV Infection)

Hepatitis C Screening

AU comment: Hepatitis testing in MSM

(HCV antibody or, if indicated, HCV RNA)j

Repeat HCV screening for at-risk patientsk

Basic Chemistryl,m

Every 6–12 months

ALT, AST, Total bilirubin

Every 6–12 months

CBC with Differential

If on ZDV

If on ZDV or if CD4 testing is done

Every 3–6 months

Fasting Lipid Profilen

If abnormal at last measurement

If normal at last measurement

If normal at baseline, annually

Fasting Glucose or Hemoglobin A1C

If abnormal at last measurement

If normal at last measurement

If normal at baseline, annually

Urinalysism,o

If on TAF or TDFl

Pregnancy Testp

a This table pertains to laboratory tests done to select an ARV regimen and monitor for treatment responses or ART toxicities. Please refer to the HIV Primary Care Guidelines for guidance on other laboratory tests generally recommended for primary health care maintenance of HIV patients.1
b If ART initiation occurs soon after HIV diagnosis and entry into care, repeat baseline laboratory testing is not necessary.
c ART is indicated for all individuals with HIV and should be started as soon as possible. However, if ART initiation is delayed, patients should be retained in care, with periodic monitoring as noted above.
d If HIV RNA is detectable at 2 to 8 weeks, repeat testing every 4 to 8 weeks until viral load is suppressed to <200 copies/mL. Thereafter, repeat testing every 3 to 6 months.
e In patients on ART, viral load typically is measured every 3 to 4 months. However, for adherent patients with consistently suppressed viral load and stable immunologic status for more than 2 years, monitoring can be extended to 6-month intervals.
f Based on current rates of transmitted drug resistance to different ARV medications, standard genotypic drug-resistance testing in ARV-naive persons should focus on testing for mutations in the reverse transcriptase and protease genes. If transmitted INSTI resistance is a concern, providers should also test for resistance mutations to this class of drugs. In ART-naive patients who do not immediately begin ART, repeat testing before initiation of ART is optional if resistance testing was performed at entry into care. In patients with virologic suppression who are switching therapy because of toxicity or for convenience, viral amplification will not be possible; therefore, resistance testing should not be performed. Results from prior resistance testing can be helpful in constructing a new regimen.
g If patient has HBV infection (as determined by a positive HBsAg or HBV DNA test result), TDF or TAF plus either FTC or 3TC should be used as part of the ARV regimen to treat both HBV and HIV infections.
h If HBsAg, HBsAb, and HBcAb test results are negative, hepatitis B vaccine series should be administered. Refer to the HIV Primary Care Guidelines and the Adult and Adolescent Opportunistic Infections Guidelines for detailed recommendations.1,2
i Most patients with isolated HBcAb have resolved HBV infection with loss of HBsAb. Consider performing an HBV viral load for confirmation. If the HBV viral load is positive, the patient may be acutely infected (and will usually display other signs of acute hepatitis) or chronically infected. If negative, the patient should be vaccinated. Refer to the HIV Primary Care Guidelines and the Adult and Adolescent Opportunistic Infections Guidelines for more detailed recommendations.1,2
j The HCV antibody test may not be adequate for screening in the setting of recent HCV infection (defined as acquisition within the past 6 months), or advanced immunodeficiency (CD4 count <100 cells/mm3). HCV RNA screening is indicated in persons who have been successfully treated for HCV or who spontaneously cleared prior infection. HCV antibody-negative patients with elevated ALT may need HCV RNA testing.
k Injection drug users, persons with a history of incarceration, men with HIV who have unprotected sex with men, and persons with percutaneous/parenteral exposure to blood in unregulated settings are at risk of HCV infection.
l Serum Na, K, HCO3, Cl, BUN, creatinine, glucose (preferably fasting), and creatinine-based estimated glomerular filtration rate. Serum phosphorus should be monitored in patients with chronic kidney disease who are on TAF- or TDF-containing regimens.3
m Consult the Guidelines for the Management of Chronic Kidney Disease in HIV-Infected Patients: Recommendations of the HIV Medicine Association of the Infectious Diseases Society of America for recommendations on managing patients with renal disease.3 More frequent monitoring may be indicated for patients with evidence of kidney disease (e.g., proteinuria, decreased glomerular dysfunction) or increased risk of renal insufficiency (e.g., patients with diabetes, hypertension).
n Consult the National Lipid Association’s recommendations for management of patients with dyslipidemia.4
o Urine glucose and protein should be assessed before initiating TAF- or TDF-containing regimens and monitored during treatment with these regimens.
pThis applies to people of childbearing potential.

Key to Acronyms: 3TC = lamivudine; ABC = abacavir; ALT = alanine aminotransferase; ART = antiretroviral therapy; ARV = antiretroviral; AST = aspartate aminotransferase; BUN = blood urea nitrogen; CBC = complete blood count; CD4 = CD4 T lymphocyte; Cl = chloride; DAA = direct-acting antiviral; FTC = emtricitabine; HBcAb = hepatitis B core antibody; HBsAb = hepatitis B surface antibody; HBsAg = hepatitis B surface antigen; HBV = hepatitis B virus; HCO3 = bicarbonate; HCV = hepatitis C virus; INSTI = integrase strand transfer inhibitor; K = potassium; Na = sodium; TAF = tenofovir alafenamide; TDF = tenofovir disoproxil fumarate; ZDV = zidovudine