Hormones such as Anti-Mullerian hormone (AMH), Thyroid-stimulating hormone (TSH) and Prolactin (Prl) can be tested any day during your cycle. However, some hormones such as Follicle-stimulating hormone (FSH), Luteinising hormone (LH), and Oestradiol (E2) fluctuate throughout your cycle.
Since different hormones fluctuate throughout your cycle, if you are not on hormonal contraception, you must collect your sample on day 3 of your menstrual cycle. This is when your fluctuating hormones are at a baseline and therefore we get the most accurate results.
It’s also best to test in the morning, within 3-4 hours of waking up after fasting for at least 8 hours. Some hormones also fluctuate throughout the day - so collecting your sample first thing gives the most accurate readings.
If you have short periods
If you only have one or two days of full flow, go ahead and test on "Day 2," or the day after your full flow begins.
If you have irregular periods
That's ok too! Your Hertility kit has a shelf-life of 6 months, so test on day 3 when you can. If your cycle is longer than 45 days, you can test on any day as it may be difficult to identify where you are in your cycle. It's better to test sooner rather than keep you waiting for answers.