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TABLE 2-16:

Routine Laboratory Tests (Continued)

Test Cost* Frequency and Comment
HBsAg** $20 to $25 Screen for chronic hepatitis B. Consider HBV DNA in HBsAg negatives with abnormal transaminases.
anti-HCV** $25 HCV
EIA
Screen with anti-HCV; confirm positives with quantitative HCV RNA at $150. Consider HCV RNA in HCV- seronegatives at high risk, with abnormal transaminases, or with CD4 counts <200.
Syphilis – VDRL, RPR or treponema
EIA**
$5 to $16 Confirm positives with FTA-ABS, MHA-TP or TPPA. Repeat test annually in at risk sexually active patients. Note concerns with EIA screening (pg 48).
anti-Toxoplasma
IgG**
$12 to $15 Screen all patients at baseline, and repeat in sero - negatives if CD4 cell count is ≤100 cells/mm3 and patient does not take TMP-SMX for PCP prophylaxis or has symp toms suggestive of toxoplasmosis encephalitis. Agglutin ation assays for IgG are preferred. IgM is not useful.
Varicella IgG*   If negative or unknown history for chickenpox and shingles to promote protection against exposure, varicella vaccination and/or post-exposure ZIG.
Chemistry
Comprehensive
Chemistry
panel**
$10 to $15 Includes liver enzymes and renal function. Repeat every 6-12 months or more frequently in patients with abnormal results and with administration of hepatotoxic or nephrotoxic drugs, including most ART regimens.
G6-PD $14 to $20 Test: 1) Susceptible hosts: Primarily men (X-linked), with the following ancestry African-American, Italian, Sephardic Jew, Arab, and those from India and Southeast Asia; 2) Those with drug-induced hemolysis should be tested following recovery (see pg 57). Options are testing susceptible patients at baseline or before use of oxidant drugs – Risks include primaquine > dapsone >sulfonamides.
Lipid profile and
blood glucose
(fasting)
$20 to $40 Therapeutic monitoring recommended for patients receiving antiretroviral. Test at baseline and at 3 to 6 months post HAART with subsequent measurements annually or more frequently based on initial results and risks.**
Hematology
Complete blood
count (CBC)**
$6 to $8 Repeat every 3 to 6 months, more frequently for low values and with marrow-toxic drugs.
CD4 cell count
and CD4%**
$60 to $150 Repeat every 3 to 6 months and repeat for discordant results, including with results that are inconsistent with prior trends. Routine testing when counts are <50 cells/mm3 is of minimal use except for monitoring response to antiretroviral therapy.
Other
Chest x-ray $40 to $140 May be routine or restricted to those with past pulmonary disease, chronic pulmonary disease or a positive PPD*
PAP smear** $25 to $40 Repeat at 6 months and then annually if results are normal. Results reported as “inadequate” should be repeated. Refer to a gynecologist for results showing atypia or greater on the Bethesda scale (see pg 51-53).
(continued)

 

Chapter 2: Laboratory Tests

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