PMOS Explained — Episode 2
How Is PMOS Diagnosed?
One of the most common misconceptions about PMOS is that seeing “polycystic ovaries” on ultrasound automatically confirms the diagnosis.
In reality, PMOS is NOT diagnosed by ultrasound alone.
The diagnosis is based on the overall clinical picture.
How is PMOS diagnosed in adults?
In adults, the diagnosis is generally based on the presence of at least 2 of the following 3 features, after excluding other possible causes:
1. Ovulatory dysfunction
This usually appears as:
Irregular menstrual cycles
Infrequent periods
Absent periods
2. Hyperandrogenism
This may be:
Clinical — such as excess facial or body hair, acne, or scalp hair thinning
Biochemical — elevated androgen levels on blood tests
3. Polycystic ovarian morphology
This may be identified on ultrasound.
However, the appearance of polycystic ovaries alone does not confirm PMOS.
What about AMH?
According to current international guidance, AMH may also be used in adults as an alternative to ultrasound within the diagnostic pathway.
However, AMH should not be used as a single standalone test for diagnosing PMOS.
Very important:
If a woman already has:
Irregular cycles + hyperandrogenism
then ultrasound or AMH may not even be necessary to establish the diagnosis.
What other conditions should be excluded?
Before confirming PMOS, other conditions that may cause similar symptoms should be excluded when appropriate.
These include:
Thyroid disease
Hyperprolactinemia
Non-classic congenital adrenal hyperplasia
Cushing syndrome, when clinically indicated
Androgen-secreting tumors, when clinically indicated
What about adolescents?
Diagnosis in adolescents is different and requires more caution.
Normal puberty can sometimes mimic features of PMOS.
In adolescents, both ovulatory dysfunction and hyperandrogenism are required for diagnosis.
Ultrasound and AMH are NOT recommended for diagnosis in adolescents, because normal pubertal changes can resemble PMOS.
๐ The Key Message
PMOS is a clinical diagnosis based on the whole picture — not one blood test, not one ultrasound, and not simply the appearance of the ovaries.
A proper diagnosis takes into account:
Menstrual history
Clinical signs
Hormonal findings when needed
Ovarian morphology when appropriate
Exclusion of other possible causes
Next Episode
The different types and presentations of PMOS.
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