09/19/2025
Many women are told to get their hormone labs checked on cycle day 21. The assumption is that ovulation always happens on day 14, so day 21 should be exactly one week later when progesterone is at its peak.
But that assumption isn’t true for most women. Ovulation doesn’t always happen on day 14 — it can happen earlier, later, or vary from cycle to cycle. If you ovulate on day 18, your day 21 labs are only 3 days after ovulation, too soon to measure peak progesterone. If you ovulate on day 12, day 21 is too late. And if you don’t ovulate until day 24, your day 21 labs may look like you didn’t ovulate at all.
That’s why cycle-informed testing matters. By charting your unique cycle and drawing labs one week after your ovulation day, we can see an accurate picture of hormone function. Without timing, results can look normal or misleading — leaving women with unanswered questions.
If you’re ready for testing that actually reflects your body, schedule a free discovery call today at radiantclinic.com..
