Table I. Menstrual cycle variation in LH pulse Frequency and Amplitude.

Cycle Phase	Mean frequency (minutes)	Mean Amplitude (mIU/mL)
Early follicular	90	6.5
Mid-follicular	50	5
Late-follicular	60-70	7
Early luteal	100	15
Mid-luteal	150	12
Late luteal	200	8

From PhD thesis H.M.Fatemi, Brussels 2008.