My doctor drew my blood on October 29, 2009. FedEx tried to deliver it to VIPDx on October 30, 2009. But someone had locked the gate that led to the building and the delivery could not be made. The samples sat in the FedEx truck or FedEx building over the weekend. This means it took 4 days (not 24 hours) and it was exposed to changes in temperature while it was waiting. According to VIPDX, this delay doesn't matter. I was told that both XMRV tests are based on DNA, that DNA is durable, and so the 24 hour deadline is not required. They did, however, tell me I had to send new samples for the other tests my doctor ordered, which they said required live blood. Considering that they told me to send new samples for the other tests, I don't see any reason why they wouldn't ask for new XMRV samples unless it really didn't matter. So now I'm wondering why they make such a big deal about it having to be there in 24 hours. Note: new information from VIPDx tells me that the delay does matter, and that's why my test is messed up.