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Day 20/21 Progesterone level

The menstrual cycle typically lasts about 2 weeks. Ovulation usually occurs in the middle of the cycle. The portion of the cycle prior to ovulation is referred to as the follicular phase and portion afterwards is called the luteal phase. During the luteal phase, large amounts of a hormone called progesterone are secreted, and this progesterone helps prepare the uterus for pregnancy and helps the pregnancy get through the first few months. Progesterone levels peak a week after ovulation. Measuring progesterone levels at this peak time gives us a way to assess ovulation.

A progesterone level above 3 generally indicates that ovulation has occurred and a level 10 or higher suggests adequate production to maintain a pregnancy. When progesterone levels are used to monitor treatment, the target levels may be even higher, and these targets may vary between fertility clinics. 

Instructions for Day 20 Bloodwork at Princeton IVF

  • We are open M-F 6-9 AM on weekdays and at 7 AM only on Saturdays for blood draws.
  • We would prefer for you to make an appointment if possible, but we will still see you without an appointment.
  • While the progesterone level is scheduled for day 20 or 21 for testing purposes, this may not be the case if you are undergoing treatment. If so, we will instruct you on when to come in for bloodwork based on ultrasound, IUI or IVF transfer date.
  • Insurance permitting, we will run it in house. If so, the results will be ready the same day (M-F) or the following monday (S).
  • If you are not receiving any fertility drugs, our target level is 10.
  • If you are undergoing ovulation induction with Femara or Clomid, we will likely increase your dose if your level is less than 15. 
  • If you are pregnant or on progesterone injections for IVF, our target is 20.