HIV RNA is the viral load of AIDS. HIV RNA does not exist in normal people, so its normal value is 0copies/ml, while reagents can generally detect about 20copies/ml, so a normal person <20copies/ml is normal. For AIDS patients, their viral load is often high before taking antiviral drugs, even up to 10^7copies/ml. after taking antiviral drugs, the long-term medication can inhibit the replication of the virus in the patient's body, so that the virus continues to decline, and the HIV RNA test can also assess the effect of the medication. If HIV RNA is less than 20copies/ml, it means that the patient's treatment is very effective and the virus is below the lower limit of detection, and the patient is almost non-infectious during this period and the immune function can be gradually restored.