Ask your Onc to find out (unlikely to work), or ask the Onc where the sample is processed and call that lab (more likely to work).
Great idea, Trey. For my case, I ended up calling Emory Lab this morning. For anyone on the board who is interested in these details, here is what I learned. BTW, huge thanks to the friendly and incredibly-patient staff at the lab for connecting me with someone who actually processes the blood draws and runs the PCR test. That was very reassuring to speak to someone right at the source! The individual I spoke to was incredibly helpful and explained the process to me in reasonable detail. Note that this process could be different for other labs, but this is how my lab works:
1. Blood draw is taken at the clinic, and the sample is sent over to the lab across the street ... usually within an hour or so.
2. The RNA sample to be used for the PCR test is augmented with an RNA stabilization solution called RNAlater. Then they freeze (not refrigerate ... -freeze-) the sample.
3. She was very clear in saying that RNAlater and the freezing of samples preserves the integrity and will give just as good of a result whether it's run the next day, or a week later, or maybe even longer. She reinforced that with me several times during our conversation.
4. This particular lab runs PCRs on Tuesdays. The time of day varies depending on staffing and workload, but she said that they never have a problem processing the backlog of tests on that day. Pathology does their reviews & sign-offs on Fridays.
5. She told me that I could get my labs drawn on Monday "if it would make me feel better", but she assured me that their PCR testing methods would give essentially the same result regardless of the day I have my labs drawn.
Personally, I found this reassuring. I also had a conversation with a family friend who works at Emory and has three PCR machines in his office. He gave me the same explanation about RNAlater, and he said that it was especially effective for his work in bacterium analysis, because live bacteria deteriorates very quickly. Same situation though ... in fact, he stores his RNAlater-treated samples at ambient room temp and said that they preserve quite well.
For the most part, this is settled my stomach about my own "undetectable" result, but I am planning to take Trey's advice and schedule all future blood draws on Mondays.
I hope this is helpful for others ...