Fsh Lh Ratio Calculator - Calculator Academy

Enter the follicle stimulating hormone and the luteinizing hormone into the Calculator. The calculator will evaluate the Fsh Lh Ratio.

Educational use only; not medical advice. Lab units, reference ranges, and interpretation depend on factors like cycle day, age, pregnancy status, medications, and the lab’s assay. Any back-calculated FSH or LH value is math only and is not a substitute for a measured lab test—discuss results with a licensed clinician (e.g., an OB/GYN or endocrinologist).

Fsh Lh Ratio Formula

FLR = Fsh/Lh

Variables:

FLR is the Fsh Lh Ratio (unitless)
Fsh is the follicle stimulating hormone
Lh is the luteinizing hormone

To calculate Fsh Lh Ratio, divide the follicle stimulating hormone by the luteinizing hormone.

How to Calculate Fsh Lh Ratio?

The following steps outline how to calculate the Fsh Lh Ratio.

First, determine the follicle stimulating hormone.
Next, determine the luteinizing hormone.
Next, gather the formula from above = FLR = Fsh/Lh.
Finally, calculate the Fsh Lh Ratio.
After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem :

Use the following variables as an example problem to test your knowledge (hypothetical values for math demonstration; units: IU/L).

follicle stimulating hormone (FSH) = 8 IU/L

luteinizing hormone (LH) = 9 IU/L

FAQs

What is the importance of the Fsh Lh Ratio in reproductive health?

FSH and LH levels (and sometimes their ratio) may be reviewed as part of a clinician’s evaluation of ovulation and reproductive health. However, the ratio by itself cannot diagnose conditions such as PCOS, menopause, or infertility—interpretation depends on clinical history, cycle day, medications, and the lab’s reference ranges.

Can the Fsh Lh Ratio affect pregnancy?

FSH and LH abnormalities can be associated with ovulatory or hormonal conditions that may affect fertility, but the ratio alone does not predict whether someone can become pregnant. If you are trying to conceive or have concerns about your results, discuss them with an OB/GYN or fertility specialist.

How often should the Fsh Lh Ratio be tested?

Testing frequency depends on your situation and your clinician’s recommendations. It may be checked during a fertility evaluation or when symptoms suggest a possible hormonal imbalance.

Are there ways to improve an abnormal Fsh Lh Ratio?

Management depends on the underlying cause and may include lifestyle changes, medications, or other treatments. Because causes and reference ranges vary, it’s best to work with a licensed healthcare professional for personalized guidance.