Irregular cycles often have a hormonal explanation — thyroid imbalance, PCOS or raised prolactin. The right tests, taken at the right time, help your doctor find and treat the cause.
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Irregular, infrequent or missed periods are commonly driven by thyroid dysfunction, polycystic ovary syndrome (PCOS) or high prolactin. A thyroid test plus LH, FSH and prolactin is a sensible starting panel, often with a blood sugar test as PCOS is linked to insulin resistance.
In women, hormone samples are usually taken on day 2-3 of the cycle. Your gynaecologist interprets the results alongside an ultrasound and your history.
5 curated lab tests — your doctor decides which you actually need.
A thyroid test with LH, FSH and prolactin is the usual starting panel; testosterone and a blood sugar test are often added when PCOS is suspected.
Hormone tests are usually taken on day 2-3 of the menstrual cycle. AMH can be done on any day. Your doctor will advise based on your situation.
They support a PCOS assessment, but diagnosis also uses your symptoms and an ultrasound, interpreted together by your doctor.
Medical disclaimer
This guide is for general awareness and does not replace medical advice. Symptoms can have many causes; which tests you need depends on your history. Always consult a registered medical practitioner to interpret results and decide on treatment.
