Can Gynaecologist request bloods?

Sarah

I have a gynaecologist appointment next week and it falls on cycle day 21 (coincidence).

I have been etc for 19months and have been diagnosed with endometriosis.

From my laparoscopic surgery 4 months ago I don't think I have been ovulating. So my question is should my doctor be able to request my bloods to be checked for ovulation at that appointment?