So I posted awhile back about researching AMH and how the test is very temperature sensitive. I was actually trying to find a lab in Houston (where I live) or, at least, in Texas to do the test because I was concerned about this, but all of them sent the sample off to CA for testing. At any rate, my RE said on his own (without me even asking) that AMH can break down (so you get a lower reading) if it isn't frozen and stored correctly. He said this is of particular in our part of the country (Texas) during the summer months.
Unfortunately, he said that he didn't think that was probably the case for me because I have two low readings and even if the "undetectable" was a little low, given the time period that almost 2 years had passed since my 0.5 reading, my AMH "at best" was probably 0.2 or 0.3. He did offer to re-test it (I declined), but said he highly doubted it would come back at something good like 1.5.
Re: New RE confirmed my research on AMH
Our Thanksgiving Day baby 11/22/07
Pregnant with #2 with LPD, uterine polyp/hysteroscopy, DOR (AMH = 0.17), 2 c/ps
Our early Christmas present 12/9/10
2011: FSH 13.3 & E 99; AMH 0.54 2nd FSH 6.2 E 40's AFC: 8
BFP from Clomid/IUI ~ Pre-e and IUGR during pregnancy ~ DS born 9/4/12
Feb./March 2013: AMH less than 0.16 (undectable) and AFC = 4;
BFP from supps ~ DS#2 due May 2014
May 2014 January Siggy Challenge: