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.5 log reduction

Mar 18, 2006

I am trying to understand what a .5 log reduction. if 1 log means 10 copies what would .5 log mean?

Response from Dr. Holodniy

Here is a brief math lesson. Viral load can be expressed as absolute copy number or as log10 expression of absolute copy number. So, if you have 100,000 copies that is 5 log, 10,000 copies is 4 log, 1,000 is 3 log, 100 copies is 2 log and 10 copies is 1 log. Now, if you went from 100,000 to 10,000 copies that would be a 1 log reduction (5 - 4 log). If you went from 100,000 to 32,000 that would be a 0.5 log reduction (5 - 4.5 log) and so on.

CD4 vs viral load
what do this mean?

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