How can you know about HIV infection from general blood test?

HIV infection cannot be detected from a general blood test. Specific HIV tests are required to detect the presence of HIV antibodies or antigens in the blood. These tests include:

1. HIV antibody test: This test detects antibodies produced by the immune system in response to HIV infection. It is usually performed using a blood sample or oral fluid sample.

2. HIV antigen test: This test detects HIV antigens, which are proteins produced by the virus. It is typically performed using a blood sample.

3. HIV nucleic acid test (NAT): This test detects the genetic material of HIV in the blood. It is highly sensitive and can detect HIV infection even in the early stages before antibodies or antigens are produced.

These HIV tests are typically recommended if individuals have symptoms suggestive of HIV infection or are considered to be at risk, such as having unprotected sex, sharing needles for drug use, or having multiple sexual partners. The specific tests and testing algorithms used may vary depending on the healthcare provider and region. It is important to consult a healthcare professional for guidance and interpretation of HIV test results.