Definition
What LH/FSH Ratio measures
The LH/FSH ratio divides the two pituitary gonadotropins from the same draw. It is calculated, not separately measured.
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HormonesEssentialCompleteratio
LH/FSH Ratio
The pituitary pair used in many hormone workups
Illustrative sample band · Synthetic
1.1ratio
0.1Sample target 0.5–2 ratio3.2
Why it matters
How clinicians usually read it
Clinicians sometimes use the proportion, not just the raw pair, when reading PCOS-pattern or pituitary questions. Cycle day still dominates the interpretation.
When it reads low
A lower value can mean
A lower ratio usually means FSH is the louder of the two signals. That can be a normal follicular pattern or a rising-FSH ovarian picture.
When it reads high
A higher value can mean
A higher ratio means LH is relatively louder. It is a prompt to look at androgens, cycle history, and the raw LH and FSH — not a diagnosis.
Questions for a clinician
Bring the number into a real conversation
01
Does this ratio match my cycle day and symptoms?
02
Should we lean on the raw LH and FSH instead of the ratio?
03
Would a timed redraw change the read?
Educational boundary
Educational information only. Displayed ranges are illustrative sample bands, not a diagnosis, treatment plan, or substitute for the contracted laboratory report and a qualified clinician.
See it as a sample result
The sample dashboard shows an illustrative reading, target band, and trend for LH/FSH Ratio.