A 28-year-old lady is suspected to have the polycystic ovarian disease. The sample for testing LH & FSH are best taken on the following days of the menstrual cycle
10-Aug
4-Jan
13-15
24-26
Serum FSH concentrations vary signiﬁcantly across the cycle, hence serum FSH concentration is best obtained during the early follicular phase (cycle day 2–4)