Welcome to the forum.  You are quite right, this was a very low risk encounter.  While there are a very few cases in which HIV MAY have been transmitted through blood exposure encountered in the course of snorting cocaine they are so uncommon as to not be able to quantify how often this occurs.  Even more importantly, the Alere 4th generation test that you were tested with provided reliable test results at any time more than 28 days after an exposure.  you are in the clear.  no further reason for concern related to this exposure and no reason for further testing

I hope this comment is helpful to you.  EWH

Thanks for your explanations.  the information which can be accessed on line is sometimes helpful but all too often is taken out of context or mis-interpreted.  This problem is not helped by well respected organizations such as the CDC which give overly conservative recommendations and advice.  At the same time however, we can understand the CDC's perspective, as an (unfortunately) politicized organization providing scientific guidance, their stance is that they cannot "afford" to make a mistake.....even once.  Thus their advice tends to overly conservative and they will often fail to provide definitive advice "just in case".  In my mind, this does not serve nervous persons well.  I think the same sort of stance is all too often provided from other sources.  From a practical perspective, there is no meaningful difference between "no risk" and "theoretical" risk.  I can tell you there is no risk that you are going to be struck by lightening while reading this reply but in fact, there is a "theoretical risk" it could happen.  An advantage of this site is that the information is individualized.

You are in the clear.  For the reasons mentioned above, the CDC provides advice which conform to the results reported in FDA approved package inserts.  The FDA package inserts are based on the stated goals of the study (i.e. to prove that tests perform equivalently to already approved comparison tests which in turn used as their benchmarks for conclusive results a three month time point.  The fact however is that the data from the study showed that results were completely reliable much earlier- 8 weeks for antibody only tests and 4 weeks for combined antigen/antibody tests.  Trust the 42-44 day results of your fourth generation test. 

Hope this clarifies things.  As per Forum guidelines, this thread will be closed later today.  EWH