UD VL
See: Undetectable Viral Load

Undetectable Viral Load (UD VL)
The point at which levels of HIV RNA in the blood are too low to be detected with a viral load test. This does NOT mean that the virus has stopped replicating or has been removed from the body entirely, only that the small amount of virus remaining is below the test's ability to measure it. The viral load below which a test cannot detect the virus depends on the brand of the viral load test.
See Also:   Viral Load