The Four PCOS Phenotypes, Explained
"What type of PCOS do I have?" PCOS is diagnosed when you have at least two of three features, and which two (or three) you have defines your "phenotype." This is why two people with the same diagnosis can have very different experiences.
The three features
Under the Rotterdam framework used in the 2023 guideline, the three features are: ovulatory dysfunction (irregular or absent ovulation), hyperandrogenism (excess androgens, clinical or on blood tests), and polycystic ovarian morphology on ultrasound (or raised AMH).[3] Having any two confirms PCOS, after ruling out other causes.
The four phenotypes
| Phenotype | Features present | Typical profile |
|---|---|---|
| A (classic/full) | All three | Most common; tends to have the most pronounced metabolic and hormonal involvement[1] |
| B | Ovulatory dysfunction + androgen excess | Metabolic profile often resembles A |
| C (ovulatory) | Androgen excess + polycystic ovaries | Ovulation often preserved; usually milder metabolically |
| D (non-hyperandrogenic) | Ovulatory dysfunction + polycystic ovaries | No androgen excess; generally the mildest metabolic profile[2] |
Broadly, phenotypes with androgen excess (A and B) tend to carry more metabolic involvement, while D — without androgen excess — is often the mildest on that front.[2] Prevalence varies between studies and populations.
Why your phenotype matters
It helps explain your symptom pattern and what your care may emphasise — for instance, more attention to metabolic health in phenotype A/B, or to cycle support in D. It is a conversation to have with your doctor; the phenotype is a guide, not a rigid box, and current research is still refining how useful these categories are for tailoring treatment.
Where Lia fits
Lia is an AI PCOS companion on WhatsApp for Indian women. She remembers your story, reads your reports, builds plans only when you ask — no streaks, no judgment, nothing to sell. Free to start. Over time, Lia builds a picture of your individual features and symptom patterns — helpful context to take to a doctor who can confirm your phenotype and plan.
Start free on WhatsAppFrequently asked questions
What are the four PCOS phenotypes?
They're defined by which of three features you have — irregular ovulation, excess androgens, polycystic ovaries. A has all three, B has ovulation issues plus androgens, C has androgens plus polycystic ovaries, and D has ovulation issues plus polycystic ovaries without androgen excess.[1]
Which PCOS phenotype is most serious?
Phenotypes with androgen excess (A and B) tend to carry more metabolic involvement, while D is often mildest metabolically. But individual risk varies, so your doctor's assessment matters more than the label.[2]
PCOD ke kitne types hote hain?
Rotterdam framework ke anusaar chaar phenotypes hote hain (A, B, C, D), is aadhar par ki aapme teen me se kaunse lakshan hain: irregular ovulation, zyada androgens, aur ultrasound par polycystic ovaries. A me teeno hote hain.
How do I know my phenotype?
From your combination of cycle pattern, androgen signs or blood tests, and ultrasound/AMH findings — your doctor determines it from your assessment, not from symptoms alone.
References
- PCOS Phenotypes (Rotterdam A through D). RRM Academy Glossary. https://rrmacademy.org/glossary/pcos-phenotypes/
- The Prevalence of Metabolic Syndrome in the Different Phenotypes of PCOS. 2023. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10418812/
- International Evidence-based Guideline for the Assessment and Management of PCOS (2023). Monash University / ESHRE / ASRM. https://www.monash.edu/__data/assets/pdf_file/0003/3371133/PCOS-Guideline-Summary-2023.pdf