LH (Luteinising Hormone)
Oestrogen triggers a surge of LH around mid-cycle, which in turn causes the strongest egg to burst through the ovary wall.
LH is the substance detected by ovulation predictors.
High levels can be an indicator of Polycystic Ovary Syndrome.
For more information see:
The Female Reproductive System
Ovulation Predictors
Blood tests
Polycystic Ovary Syndrome
Links:
Getting Pregnant
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