Day 1 is the first day of bleeding

Blood test on day 3
FSH (Control hormone from the brain)
Estradiol (Ovarian hormone)

Clomiphene 100 mg (two 50 mg pills) day 5 to 9 by mouth

Blood test on day 10
FSH (Control hormone from the brain)

Healthy day 3 and day 10 FSH levels are less than 10. 

Values of 10 to 18 are intermediate and are sometimes associated with lower fertility and higher miscarriage rates. 

Pregnancies are rare and miscarriages increase with high FSH values more than 18.  The clinical name for this is diminished ovarian reserve (DOR).  The miscarriage rate has been 57% at age 35 and 90% at age 40 with DOR. DOR is often treated with donor eggs.  However, hormonal treatment with estrogen and progesterone has lowered the miscarriage rates to 30% and 50% in one study.  Successful pregnancies have occurred with values as high as 143 using hormonal treatment in one study.  The highest value in my practice has been 22.

Live births have generally occurred when the day 3 FSH is less than 14, the estradiol less than 81, and the age less than 43 years. 

Buyalos RP; Daneshmand S; and Brzechffa PR.  Basal estradiol and follicle-stimulating hormone predict fecundity in women of advanced reproductive age undergoing ovulation induction therapy.  Fertil Steril 68:272-277, 1997

Check JH, Check ML, Katsoff D. Three pregnancies despite elevated serum FSH and age. Human Reprod 2000

Corson SL.  The simple screen can predict ART failure.  Ob/Gyn Management, pages 30-34, October, 1998.

Levi AJ; Raynault MF; Bergh PA; Drews M R; Miller BT; Scott RT. Reproductive outcome in patients with diminished ovarian reserve. Fertil Steril. 76: 666-669, 2001.