sensitive (lc/ms/ms)

Anyone know the difference between E2 sensitive, and E2 ultrasensitive? And which one should I get? They’re both the same price on discounted labs.com. Thanks.

I have ordered the Sensitive Estradiol Test (LC/MS/MS) and I want to know if there is a particular day I should have it done as far as when my weekly Testosterone Cypionate shot is given, or can I do it on any day? I know when testing for total testosterone it's best to draw the blood the day...