Q: How long should my temperature after ovulation stay up?

A: Ideally your temperature stays up 12-16 days after ovulation. Some doctors say anything over 10 days is acceptable, but it really makes sense to test for luteal phase defect if one typically shows 12 days or less of high temperatures. You can test for luteal phase defect with a serum progesterone level and/or an endometrial biopsy. Many doctors will want to see two cycles of low progesterone or out of phase biopsies before making a definite luteal phase defect diagnosis.