Question

nat test
answers: a - d
a used if a person has been in a high - risk situation
b requires a small sample of blood or oral fluid
c detects the presence of hiv antibodies in the blood
d gives results in 20 minutes

Explanation:

To solve this, we analyze each option based on knowledge about NAT (Nucleic Acid Test, often for HIV):

• Option A: NAT is used in high - risk situations (e.g., possible recent exposure) as it can detect the virus earlier than antibody tests. This is correct.
• Option B: NAT typically requires a blood sample (not oral fluid, which is more common in antibody tests). So this is incorrect.
• Option C: NAT detects the virus (RNA/DNA), not HIV antibodies (that's antibody tests). So this is incorrect.
• Option D: NAT results usually take longer than 20 minutes (processing time for viral genetic material analysis is more extensive). So this is incorrect.

Answer:

A. used if a person has been in a high - risk situation