The full PCOS laboratory workup, how the 2023 international criteria work, which conditions must be excluded and the metabolic tests that matter most.
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How luteinising hormone is used to time ovulation, what the LH to FSH ratio means in PCOS, and how blood LH differs from urine ovulation kits.
When a DHEA-sulphate test is genuinely useful, what a high or low result suggests, and why it belongs in a panel rather than on its own.