In a 42-year-old premenopausal woman, are estradiol of 388 pg/mL, follicle‑stimulating hormone (FSH) of 9.2 IU/L, luteinizing hormone (LH) of 16 IU/L, total testosterone of 73 ng/dL, and progesterone <0.5 ng/mL normal?

Hormone Lab Interpretation in a 42-Year-Old Woman

These labs show a pattern consistent with the periovulatory (mid-cycle) phase of a normal menstrual cycle, though the very low progesterone suggests either early follicular phase timing or anovulation—you need to know the exact cycle day and clinical context to determine if this is truly normal.

Understanding the Results by Hormone

Estradiol: 388 pg/mL

This estradiol level is elevated but physiologically appropriate for certain phases of the menstrual cycle. During the pre-ovulation peak (mid-cycle), estradiol classically reaches 150–200 pg/mL per mature follicle 1. Your patient's level of 388 pg/mL could represent:

• A normal pre-ovulatory surge with 2 mature follicles
• Late follicular phase with a dominant follicle
• An estradiol-secreting ovarian cyst (though less likely without other symptoms)

Critical caveat: Estradiol must be interpreted based on cycle timing. Guidelines emphasize that plasma testosterone and other hormones are best assessed on days 4–10 of the menstrual cycle in regularly cycling women, when norms are standardized 2. The same principle applies to estradiol interpretation.

FSH: 9.2 IU/L

This FSH level is normal for a premenopausal woman. In women aged 40–44 years with regular cycles, mean follicular phase FSH is approximately 5.2 IU/L, rising to 13.0 IU/L in the 45–49 age group 3. Your patient's value of 9.2 IU/L falls within the expected range for her age, showing no evidence of diminished ovarian reserve or approaching menopause (which would show FSH >25 IU/L) 1.

LH: 16 IU/L

This LH is mildly elevated and requires careful interpretation:

• If drawn during the mid-cycle LH surge, this is completely normal (the pre-ovulation peak shows high FSH and LH with estradiol >150 pg/mL) 1
• If drawn during early follicular phase, this warrants consideration of polycystic ovary syndrome (PCOS), though an LH/FSH ratio of 1.74 is below the classic PCOS threshold of >2.5 4
• The combination of elevated LH with high estradiol and low progesterone most strongly suggests mid-cycle timing

Total Testosterone: 73 ng/dL

This testosterone level is at the upper limit of normal or mildly elevated for premenopausal women. While commercial laboratories often have inaccurate reference ranges 4, research publications typically report lower normal ranges for women without hyperandrogenism. A total testosterone of 73 ng/dL warrants clinical correlation:

• If the patient has hirsutism, acne, menstrual irregularity, or other signs of hyperandrogenism, this level supports further evaluation for PCOS or other hyperandrogenic disorders 2
• If the patient is asymptomatic with regular cycles, this may represent normal variation, though guidelines recommend rechecking with free testosterone in a reliable specialty laboratory 2

Important: Testosterone should ideally be measured in early morning on days 4–10 of the menstrual cycle for accurate interpretation 2.

Progesterone: <0.5 ng/mL

This very low progesterone is abnormal if drawn during the luteal phase but normal if drawn during the follicular phase or at ovulation. Progesterone <1 ng/mL indicates:

• Follicular phase timing (most likely given the high estradiol and elevated LH suggesting pre-ovulation)
• Anovulation if this was intended to be a mid-luteal measurement
• Not yet ovulated if drawn at the LH surge

Clinical Algorithm for Interpretation

Step 1: Determine cycle timing

• If labs were drawn on days 4–10 (early follicular): The high estradiol and LH are abnormal; consider ovarian cyst or approaching ovulation
• If labs were drawn mid-cycle (days 12–16): Pattern is consistent with pre-ovulatory surge—completely normal
• If labs were drawn on days 21–23 (mid-luteal): Low progesterone indicates anovulation—abnormal

Step 2: Assess for hyperandrogenism

• Does the patient have hirsutism, acne, androgenic alopecia, menstrual irregularity, or central obesity?
• If YES: The testosterone of 73 ng/dL warrants full PCOS workup including pelvic ultrasound, DHEAS, 17-hydroxyprogesterone, prolactin, and metabolic screening 2
• If NO: Recheck testosterone with free testosterone in a reliable laboratory during early follicular phase 2

Step 3: Rule out concerning pathology

• The estradiol of 388 pg/mL with progesterone <0.5 ng/mL could indicate an estradiol-secreting cyst if not mid-cycle timing 1
• Consider pelvic ultrasound if cycle timing doesn't explain the hormone pattern 2

Common Pitfalls to Avoid

1. Ignoring cycle timing: These hormones fluctuate dramatically across the menstrual cycle. Without knowing the exact cycle day, definitive interpretation is impossible 2, 4.

2. Using unreliable testosterone assays: Many commercial laboratories provide inaccurate testosterone measurements and reference ranges for women 4. If hyperandrogenism is suspected, use a specialty laboratory with validated assays.

3. Missing anovulation: If this progesterone was intended as a mid-luteal measurement to confirm ovulation, the value <0.5 ng/mL indicates anovulation, which has implications for fertility and PCOS diagnosis 5.

4. Overlooking age-related changes: At age 42, this patient is approaching the age when FSH begins to rise and inhibin falls, though her FSH of 9.2 IU/L shows she's not yet in that transition 3.