During the follicular phase, the pituitary gland releases follicle-stimulating hormone (FSH)-this is essentially the time in which the ovaries are preparing to release an ovum (AKA “egg”).įinally, we enter the luteal phase, which begins with ovulation. This process also kicks off the follicular phase, which begins on day one of a woman’s period and continues until ovulation, for a total of about 16 days. This typically lasts 3-7 days but can vary between individuals. In this article, we’ll take a look at why a regular cycle is important and how blood testing with InsideTracker can be best executed according to your menstrual cycle.Ī summary of the natural hormonal changes at each menstrual cycle phaseĪ woman's menstrual cycle has four different phases-the menstrual, follicular, ovulation, and luteal phases-but they are often broken down more broadly into just the follicular and luteal phases.įirst comes the menstrual phase, when a woman gets her period and her levels of the hormones estrogen and progesterone drop. In general, it's best practice to get blood tests done at the same point in your menstrual cycle each time for consistent comparisons.Ī woman’s period can be a very personal topic.* But here at InsideTracker, we strive to provide evidence-based science to empower individuals to take control of their health-so let's talk about it. And these fluctuations can have important implications when interpreting blood test results. We know that sex hormones fluctuate substantially throughout the menstrual cycle, but are other blood biomarkers influenced by your period, too? Yes-research shows that many blood biomarkers (including those in your iron, lipid, and inflammation groups) can vary substantially according to menstrual cycle phase.
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