Ovulation can be diagnosed by all except
Measuring day 14 serum progesterone
Rise in basal body temperature in the second half of cycle
Study of cervical mucus
Endometrial histology
Tests for ovulation: Basal body temperature, Endometrial biopsy, Fern test, and ultrasound.
But plasma concentration of progesterone rises only after ovulation and reaches its the peak of 15ng/ml by mid-luteal phase.