question: I just had my blood hormone levels checked and the results came back that I had low vitamin D levels.  The rest of the hormone levels all came back as normal; however, I don't think the results are based on my menstrual cycle.  When I had the blood work done, they didn't even ask the date of my last period.  Now I am really confused as to what the test results really mean.  Last period was 4/15/13 and I'm about a 31-33 day cycle.  Estradiol - 77pg/Ml; Luteinizing Hormone - 6.4 mIU/ML; Progesterone - 3.3 ng/ML; FSH 6.4 - mIU/ML; TSH 1.95 - uIU/mL; Hydroxy, Vitamin D - 20ng/ML.  Can you help me understand the results?  Are the levels really normal?