The short explanation
PCOS is diagnosed on a pattern, not on one finding. The widely used approach requires two of three things — irregular or absent ovulation, signs of raised androgens either on examination or on a blood test, and polycystic-looking ovaries on a scan — with other conditions that mimic it ruled out first.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- Because two of three is enough, two women can both have PCOS and share almost no symptoms. One may have irregular cycles and a scan finding with no skin or hair changes at all; another may have regular cycles, acne and raised androgens. That is why treatment is discussed goal by goal rather than as one prescription for a single condition.
- The conditions excluded first — thyroid disease, raised prolactin, and certain adrenal conditions — are excluded because they are treated completely differently. This is why a clinician orders blood tests before accepting the diagnosis rather than after.
- A normal testosterone result does not rule PCOS out, and visible signs on examination count as evidence of raised androgens in their own right.
- The name is misleading and that matters, because it frightens people. The follicles seen on an ultrasound are not cysts in the sense of something that needs removing, and having polycystic-looking ovaries on a scan is not by itself a diagnosis.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you whether you have PCOS. That requires the pattern across your history, an examination, blood tests and often a scan, interpreted together.
- This cannot tell you what your particular results mean. A number on a report only means something against the laboratory's own reference range and against everything else about you.
- This explanation was written by AskHer's editorial team from the guidance listed under Sources. A clinician registered in India has not signed this version off yet — that is why no clinical reviewer is named at the foot of this page, and it is why nothing here is a diagnosis.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Which of the criteria do you think I meet, and on what evidence?
- What else did you rule out, and how?
- Was my thyroid and prolactin checked?
- If I only meet one criterion, what does that mean — do we watch, or do we investigate further?
- What should be monitored from here, and how often?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Get help the same day
- you have very heavy bleeding with dizziness or breathlessness
Book an appointment soon
- you have gone three months or more without a period
- you have new or rapidly worsening hair growth, hair loss or acne
- you have been given a PCOS diagnosis on a scan alone and nothing else was checked
- you have PCOS and are planning a pregnancy
Sources
The evidence this explanation is built on.
- Polycystic ovary syndrome World Health Organization
- Polycystic ovary syndrome (PCOS) NHS
- FOGSI–ICOG Good Clinical Practice Recommendations Federation of Obstetric and Gynaecological Societies of India
- National Institute for Research in Reproductive and Child Health Indian Council of Medical Research
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off. That is what the “Editorially reviewed” badge means, and why it does not say “Clinically reviewed”. It was written and checked by AskHer’s editorial team against the sources listed above, and it is queued for a clinician who works in this area.
- Review status
- Editorially reviewed
- Last reviewed
- Last reviewed 22 August 2026
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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