I just had to write this because I have read so much about AMH levels being the 'gold standard' of ovarian reserve testing and people getting very badly upset and freaked out by low level results...
In March 2010 I had an AMH test at Zita West clinic which came out at 5.04. This is "low" on the pmol/L scale. I was given quite a doom and gloom spiel about it and was very upset. The impression given is that AMH levels do not fluctuate in your cycle and they only get lower with age. Well, in my case - bullshit. Just had another test a few days ago and my AMH has gone UP (not by much, only to 8.6 ish), but still. I'm 37 so it's roughly what you'd expect for my age, maybe a bit lower.
I really think we should be told that this test is NOT necessarily accurate ( it may even vary from lab to lab) and is certainly not the definitive answer it's made out to be.