Infectious diseases specialists diagnose and treat infections from bacteria, viruses, fungi, and parasites, focusing on fevers, antibiotics, and vaccines.
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Diagnosing HIV is now a detailed scientific process. It has moved from simple antibody tests to advanced methods that can find the virus very early. At Liv Hospital, the goal is to shorten the window period—the time between infection and when a test can detect HIV—and to provide a full evaluation that helps plan long-term care. This process checks for the virus and also looks closely at the patient’s virus type, immune system, and genetic details.
Diagnostic accuracy relies on understanding the biology of early infection. After HIV enters the body, distinct viral markers appear in the blood at different times. First, the viral RNA becomes detectable, followed by the p24 antigen (a viral protein), and finally, the host’s antibody response (IgM and IgG antibodies). Modern testing algorithms utilize “fourth-generation” assays to capture these markers as early as possible.
Diagnosing HIV follows a careful step-by-step process to make sure the results are accurate. It starts with a sensitive screening test, usually the antigen/antibody combination. If the test is negative, the person is considered uninfected. If it is positive, another test is done to find out which type of HIV is present. If the results do not match (for example, the first test is positive but the second is negative), a Nucleic Acid Test is used to check for early infection before antibodies appear. This careful process helps avoid false positives and makes sure the diagnosis is correct.
Upon confirmation of HIV infection, a comprehensive medical evaluation is initiated to stage the disease and check for comorbidities. This sets the baseline against which the success of future treatment will be measured.
Modern HIV care uses personalized medicine. For example, doctors must check for the HLA-B*5701 gene before giving abacavir, a common HIV drug. People with this gene are at high risk for a serious, possibly life-threatening allergic reaction to the medicine. This genetic test helps prevent bad reactions and allows doctors to choose the safest drugs for each patient.
Because HIV shares transmission routes with other pathogens and affects systemic health, the evaluation includes a broad screen for co-infections and organ health.
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The window period is the time between when a person is exposed to HIV and when a test can accurately detect the infection. During this time, a person may be infected and infectious but still test negative. The length of the window period depends on the type of test used; nucleic acid tests have the shortest window (10-33 days), while antibody tests have a longer window (23-90 days).
Multiple tests are used to ensure absolute accuracy. The initial screening test is designed to be extremely sensitive so it doesn’t miss any infections, but this can rarely lead to a false positive. A second, different type of test (a confirmatory test) is specific and is used to verify the first result. This two-step algorithm ensures that a diagnosis is correct before treatment begins.
Drug resistance testing analyzes the HIV genes found in a patient’s blood. It looks for specific mutations that would allow the virus to survive in the presence of certain antiviral medications. This information helps the doctor choose a medication combination that the virus is not resistant to, ensuring the treatment will successfully suppress the viral load.
HIV, Hepatitis B, and Hepatitis C share similar routes of transmission, such as sexual contact or blood exposure, so co-infection is common. Furthermore, HIV can accelerate the liver damage caused by hepatitis. Knowing the hepatitis status is vital because it changes the choice of HIV medications, as some drugs are active against both HIV and Hepatitis B.
The HLA-B5701 test is a genetic blood test performed before starting a patient on a specific HIV medication called abacavir. Some people have a genetic variation (the HLA-B5701 allele) that makes them allergic to this drug. If they take it, they can have a severe, dangerous reaction. Testing beforehand prevents this reaction by identifying who should not use abacavir.
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