“Log drop” refers to another way of looking at viral load through the use of logarithms.
An example:
Baseline viral load of 1,500,000
150,000 = 1 log reduction (-90%)
15,000 = 2 log reduction (-99%)
1,500 = 3 log reduction (-99.9%)
150 = 4 log reduction (-99.99%)
The PCR count is equivalent to viral load; the PCR test is used to calculate viral load.
No, unfortunately one must be undetectable for virus at 4 weeks in addition to having started therapy with a low viral load (<400,000 IU/mL) to qualify for abbreviated therapy. Additionally, there cannot be HIV or cirrhosis present either.
Good luck, and welcome--
--Bill
To be considered RVR (rapid virological response) you must be UND (undetectable by PCR) at 4 wks.
You said your husband's starting viral load was at 5.5 million. To obtain that number they did an HCV RNA by PCR. In order for your doctor to state he has cleared 99 percent of the virus another PCR was done.
Log drops are calculated by subtracting the zeros off the end of the initial viral load.
For instance 5,500,000 with a two log drop would be 55,000. A three log drop would be 5,500 and a four log drop would be 550.
Trinity
Let me start by saying I am so glad you are all here blogging because the doctor makes us feel like a number, if you know what I mean.
What is all this log drop people talk about?
What is the PCR count?
At 99% in 4 weeks that is still not considered a rapid responder who could cut the treatment short?
the remaining 1% from 5.5 mil is about a log 2 drop in viral load.
Log 2 drop at end of wk 12- is absolute minimum requirement to continue treatment. VL should be undetectable at the end of wk 12 for a possible svr outcome at end of treatment and beyond..
Now since he has reached the log 2 drop at week 4, there are 8 more weeks on his side to improve the VL and become undetected at end of week 12, which is an important milestone in making treatment decisions.
So it is encouraging to know that he is responsive to treatment and it is a good earlier number indicating that the treatment is on track.
Is that 5.5 million to about 50,000?
Thats about a 2 log drop, which is what they are looking for in the first 12 weeks
When I treated, I thought my 96 per cent drop was good, but it really is just so so.
Yes, he is responding very well if his viral load has decreased by that much in 4 weeks. Do you have the 4 wk PCR count?
Trinity