WHAT DOES NEGATIVE OR "NOT DETECTED" MEAN?
The viral load can range from "not detected" to hundreds of millions. The meaning of "not detected" or "negative" differs, depending on the test used. In one lab, the detection limit for the *quantitative* HCV RNA test by *PCR* is 200 virus equivalents/ml (and with the *qualitative* test they can detect down to 10 virus equivalents/ml). The less expensive quantitative *bDNA* test has a detection limit of about
200,000 virus equivalents/ml. So it is less sensitive, but above its detection limit it is more accurate than the PCR test.
So, when you are "negative", maybe you have no Hepatitis C virus in your blood. But maybe also, you do have Hepatitis C virus in your blood, but the number of viruses is lower than the detection limit. {Example: If the less expensive quantitative *bDNA* has been used, and the detection limit is 200,000 virus equivalents/ml, any number less than this would register as "negative" or "not detected", when in fact, the viral load could be present, but less than this detection limit.} Your lab can tell you which testing measure is used, and your doctor can explain what it means in your case.
www.hepatitiscentral.com/hepatitis-c/what-is-viral-load.htmlPost Edited By Moderator (MamaLama) : 3/28/2014 4:22:36 PM (GMT-6)