I've read you can get a decent picture of serotonin by getting a full neurotransmitter panel from urine sample, this may be a good idea. It also includes a lot of interesting stuff.I meant that HbA1c is practically useless. That's a 5 hr OGTT (oral glucose tolerance test) gives you a more accurate picture of your blood sugar health. However, it is too cumbersome and it's been bastardized ino a 2hr OGTT which is as good as nothing. I believe also that since some patients may faint and in a Talmudist shyster world we live in, the risk of a costly lawsuit is real and it isn't offered anymore. But I do my own 5hr OGTT at a lawsuit-free environment called home.