LH or progesterone: Sometimes the rise in the pituitary hormone lh (luteinizing hormone) is detected by a blood test to document whether ovulation will occur. This rise in lh usually happens 24-36 hours before ovulation. Alternatively, if a Progesterone hormone level is measured and is elevated it is presumptive evidence of ovulation as the ovary does not produce Progesterone unless the egg has been released.
Answered 3/30/2016
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