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For nucleic acid tests, like the viral load blood test, it can take anywhere from 10–33 days for the test to provide an accurate result. If an individual's first HIV test is positive, it is recommended for them to take a second test to confirm the results. If this follow-up test is also positive, an HIV positive diagnosis can likely be made. [14]
In the past nucleic acid tests have mainly been used as a secondary test to confirm positive serological results. [3] However, as they become cheaper and more automated, they are increasingly becoming the primary tool for diagnostics and can also be use for monitoring of treatment of viral infected individuals t.
Rotavirus. A nucleic acid test (NAT) is a technique used to detect a particular nucleic acid sequence and thus usually to detect and identify a particular species or subspecies of organism, often a virus or bacterium that acts as a pathogen in blood, tissue, urine, etc. NATs differ from other tests in that they detect genetic materials (RNA or DNA) rather than antigens or antibodies.
The standard test for HIV is an enzyme immunoassay test that reacts with antibodies to the virus. This test has a window period where a person will be infected but not yet have an immune response. Other tests are used to look for donors during this period, specifically the p24 antigen test and nucleic acid testing.
Blood testing includes liver enzymes, serology (i.e. for autoantibodies), nucleic acid testing (i.e. for hepatitis virus DNA/RNA), blood chemistry, and complete blood count. [33] Characteristic patterns of liver enzyme abnormalities can point to certain causes or stages of hepatitis.
The transmission of hepatitis C via transfusion currently stands at a rate of about 1 in 2 million units. As with HIV, this low rate has been attributed to the ability to screen for both antibodies as well as viral RNA nucleic acid testing in donor blood.
A 2010 review study by Puren et al. [2] categorizes viral load testing into three types: (1) nucleic acid amplification based tests (NATs or NAATs) commercially available in the United States with Food and Drug Administration (FDA) approval, or on the market in the European Economic Area (EEA) with the CE marking; (2) "Home–brew" or in-house NATs; (3) non-nucleic acid-based test.
Qualitative detection of HIV-1 RNA and hepatitis C virus (HCV) RNA from volunteer donors of whole blood and blood components, screen of live organ donors, and test blood specimens to screen cadaveric donors. HBV screening of individual samples and pooled samples. 10/3/2006: Gen-Probe San Diego, CA US Licence 1592 Chiron Corporation
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