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Pre-Exposure Prophylaxis (PrEP) HIV Profile, Male, Monitor
Chlamydia trachomatis; Neisseria gonorrhoeae; creatinine, serum; eGFR calculation; enzyme immunoassay (EIA) for antigen/antibody screen for HIV with reflex to supplementary differentiation assay for HIV-1 or HIV-2. The antigen/antibody assay detects antibodies to HIV-1 and HIV-2 as well as HIV-1 p24 antigen. Specimens positive by the screening assay but negative by the supplementary antibody typing assay will reflex to qualitative nucleic acid amplification (NAA). This test also includes Treponema pallidum (syphilis) with reflex to qualitative rapid plasma reagin (RPR) on positives.
This profile requires a dedicated, unopened, gel-barrier tube.
Tests included within this profile may exhibit interference when sample is collected from a person who is consuming a supplement with a high dose of biotin (also termed as vitamin B7 or B8, vitamin H, or coenzyme R). It is recommended to ask all patients who may be indicated for testing about biotin supplementation. Patients should be cautioned to stop biotin consumption at least 72 hours prior to the collection of a sample.
Serum and urine
6 mL refrigerated serum and 2 mL of a 20 mL to 30 mL urine collection
4 mL refrigerated serum (Note: This volume does not allow for repeat testing) and 2 mL of a 15 mL urine collection
Gel-barrier tube and APTIMA® urine specimen transport
Serum specimen: Usual blood collection technique.
Urine specimen: The patient should not have urinated for at least one hour prior to specimen collection. Direct patient to provide a first-catch urine (approximately 20 to 30 mL of the initial urine stream) into a urine collection cup free of any preservatives. Collection of larger volumes of urine may result in specimen dilution that may reduce test sensitivity; lesser volumes may not adequately rinse organisms into the specimen. Add urine to the APTIMA® Combo 2 urine collection device. The final volume must be between the two black lines on the device (about 2 mL).
Serum: Gel-barrier tubes refrigerated up to 14 days
APTIMA® Urine: Maintain at room temperature or refrigerate (2°C to 30°C)
Urine: 30 days (stability provided by manufacturer or literature reference)
Serum: 14 days (stability provided by manufacturer or literature reference)
Patient should not have urinated for one hour prior to specimen collection.
Causes for Rejection
Hemolysis; lipemia; received outside of specimen and/or storage and/or labeling requirements; aliquot received for HIV testing; specimen in expired transport or incorrect transport device; specimens with inappropriate source for test requested; APTIMA® urine transport >30 days from collection; APTIMA® urine transport with incorrect specimen volume
Detect HIV infection using fourth-generation HIV antigen-antibody assay; detect Chlamydia trachomatis and Neisseria gonorrhoeae; serological test for screening for syphilis infection; the estimated glomerular filtration rate (eGFR) provides an assessment of the filtering capacity of the kidney
Fourth-generation HIV antigen-antibody specimens with repeatedly reactive results must be investigated by additional supplemental tests. A negative test for an individual does not preclude exposure to or infection with HIV-1 and/or HIV-2. Negative results can occur if the quantity of the marker present in the sample is too low for detection by the assay or if the marker is not present during the stage of disease in which a sample is collected. All estimates of GFR based on serum creatinine will be less accurate for patients at the extremes of muscle mass (including frail elderly, critically ill, or cancer patients), those with unusual diets, and those with conditions associated with reduced secretion or extrarenal elimination of creatinine.
See individual test components.