Polycystic ovary syndrome is one of the most common hormonal conditions affecting women of reproductive age, and one of the most frequently misdiagnosed in both directions. Some women live with it for years without a diagnosis. Others are told they have it on the basis of an ultrasound alone, which is not how it is diagnosed.
A meta-analysis of Indian studies published in 2023 found a pooled prevalence of 11.33% using the Rotterdam criteria and 5.8% using the stricter NIH criteria – a difference that itself shows how much the diagnosis depends on which definition is applied.
This guide covers the warning signs, how PCOS is actually diagnosed, which blood tests matter, and which tests rule out conditions that imitate it.
8 Warning Signs Worth Acting On
1. Irregular or missed periods
The most common sign. Cycles that are consistently longer than 35 days, fewer than eight periods a year, or unpredictable gaps point to irregular ovulation.
2. Unwanted hair growth (hirsutism)
Coarse, dark hair on the face, chin, chest, abdomen or back, following a male pattern. Clinicians score this using a modified Ferriman-Gallwey scale, with a threshold of 4 to 6 depending on ethnicity.
3. Persistent adult acne
Acne that continues well past adolescence, particularly along the jawline, chin and upper neck, and that does not respond to standard skin treatment.
4. Hair thinning on the scalp
Loss of hair volume at the crown and along the parting, while the frontal hairline is preserved.
5. Weight gain, particularly around the abdomen
Weight that increases steadily and is difficult to lose despite consistent effort, concentrated around the waist.
6. Darkened skin patches
Velvety, darkened skin at the back of the neck, underarms or groin, known as acanthosis nigricans. This is a visible marker of insulin resistance.
7. Difficulty conceiving
PCOS is among the most common causes of ovulation-related infertility, and irregular ovulation is the mechanism.
8. Skin tags, fatigue and mood changes
Less specific, but frequently reported alongside the signs above.
Important: none of these alone confirms PCOS. Each has other possible causes, which is why diagnosis follows a defined process.
How PCOS Is Actually Diagnosed
The 2023 International Evidence-Based Guideline for the Assessment and Management of PCOS sets out a clear framework.
For adults
Diagnosis uses the Rotterdam criteria: two of the following three, after other causes have been excluded.
- Clinical or biochemical hyperandrogenism – hirsutism, or raised androgens on a blood test
- Ovulatory dysfunction – irregular or absent periods
- Polycystic ovarian morphology on ultrasound, or a raised AMH level
A point most people do not know: if irregular cycles and hyperandrogenism are both present, an ultrasound is not needed at all. The diagnosis is already met.
For adolescents
Both hyperandrogenism and ovulatory dysfunction are required. Ultrasound and AMH are not recommended for diagnosis in adolescents, because they lack specificity at that age. The guideline advises against using ultrasound or AMH for diagnosis within 8 years of the first period, and suggests that girls with some features be considered “at increased risk” and reassessed later.
This matters because irregular cycles in the first few years after menarche are often normal, and ovaries can look polycystic in healthy young women.
The Blood Tests Used
Testing for excess androgens
- Total testosterone and free testosterone are the primary tests. Free testosterone is often estimated using the calculated free androgen index.
- If both are normal but suspicion remains, androstenedione and DHEAS may be considered, though they are less specific.
- Assay quality matters. The guideline recommends validated LC-MS/MS for total testosterone and advises against direct immunoassays, which have limited accuracy.
- If you are on the combined oral contraceptive pill, androgen testing is unreliable. If testing is essential, the pill needs to be withdrawn for at least three months with alternative contraception in place – a decision for your doctor, not something to do on your own.
AMH (anti-Müllerian hormone)
AMH may be used in adults as an alternative to ultrasound for defining polycystic ovarian morphology. Three caveats from the guideline:
- It should not be used alone to diagnose PCOS
- Use either AMH or ultrasound, not both, to avoid overdiagnosis
- It is not to be used in adolescents
Tests to exclude conditions that mimic PCOS
Several conditions produce overlapping symptoms and must be ruled out:
- TSH – thyroid disorders cause irregular cycles and weight change
- Prolactin – a raised level causes irregular or absent periods
- 17-hydroxyprogesterone – to exclude non-classic congenital adrenal hyperplasia
Where periods have stopped entirely or symptoms are severe or rapidly progressive, a doctor may investigate further for other causes.
Metabolic Testing: The Part That Gets Skipped
PCOS is not only a reproductive condition. The 2023 guideline recommends metabolic assessment at diagnosis, regardless of age or BMI:
| Assessment | Guideline position |
|---|---|
| Glycaemic status | Assess at diagnosis in all adults and adolescents. A 75 g oral glucose tolerance test is the most accurate, regardless of BMI. Where OGTT isn’t feasible, fasting glucose and/or HbA1c may be used, with reduced accuracy. Reassess every 1–3 years based on risk |
| Lipid profile | At diagnosis, regardless of age or BMI. Frequency afterwards depends on risk factors |
| Blood pressure | Annually, and when planning pregnancy or fertility treatment |
| Fasting insulin | Not recommended in routine care |
That last line is worth noting, because fasting insulin and insulin resistance panels are frequently sold as PCOS testing. The guideline does not recommend them for routine clinical care.
Women planning pregnancy or seeking fertility treatment should be offered an OGTT, and again during pregnancy.
What an Ultrasound Actually Looks For
When an ultrasound is used in adults, it is not simply looking for “cysts”. The guideline specifies:
- Follicle number per ovary of 20 or more in at least one ovary is the preferred marker with current equipment
- Where older equipment is used or image quality is inadequate, ovarian volume of 10 ml or more, or 10 or more follicles per section, in at least one ovary
- Transvaginal ultrasound is the most accurate route, where acceptable to the patient
The structures seen are immature follicles, not true cysts. This is why “polycystic” is a misleading name, and why a report mentioning a few follicles does not mean PCOS.
PCOS or PCOD: Is There a Difference?
The terms are used interchangeably in everyday conversation in India. “PCOD” is the older, informal usage. The clinical literature and international guidelines use PCOS – polycystic ovary syndrome. There is no separate diagnostic standard for PCOD.
What Happens After Diagnosis
Management is individualised and decided with a doctor, but it generally combines:
- Lifestyle measures as the foundation, with attention to activity, nutrition and sleep
- Cycle regulation where appropriate
- Treatment for specific symptoms such as hirsutism or acne
- Metabolic monitoring on the schedule above
- Fertility support when relevant
PCOS is a long-term condition rather than something cured by a single intervention, and it is managed well in most women.
Frequently Asked Questions
1. Which blood tests are done for PCOS?
The main tests are total and free testosterone for androgen excess, plus TSH, prolactin and 17-hydroxyprogesterone to exclude conditions that mimic PCOS. AMH may be used in adults instead of ultrasound. Metabolic tests at diagnosis include an oral glucose tolerance test and a lipid profile.
2. Can a blood test alone diagnose PCOS?
No. PCOS is diagnosed using the Rotterdam criteria, which require two of three features: hyperandrogenism, ovulatory dysfunction, and polycystic ovarian morphology on ultrasound or a raised AMH. Blood tests supply part of the picture and rule out other conditions, but the diagnosis is clinical.
3. Is AMH a PCOS test?
AMH may be used in adults as an alternative to ultrasound for defining polycystic ovarian morphology, but the 2023 international guideline states it should not be used alone to diagnose PCOS. It is also not recommended for diagnosis in adolescents.
4. Do I need an ultrasound to diagnose PCOS?
Not always. If you have both irregular cycles and hyperandrogenism, the guideline states ultrasound is not needed, because the criteria are already met. Ultrasound is also not recommended for diagnosis within 8 years of the first period.
5. What is the difference between PCOS and PCOD?
They refer to the same condition in everyday usage in India. PCOD is the older, informal term. Clinical literature and international guidelines use PCOS, polycystic ovary syndrome, and there is no separate diagnostic standard for PCOD.
6. How common is PCOS in India?
A 2023 meta-analysis of Indian studies found a pooled prevalence of 11.33% using the Rotterdam criteria and 5.8% using the stricter NIH criteria. The gap reflects how much the figure depends on which diagnostic definition is applied.
7. Can I get PCOS tests done if I am on birth control pills?
Androgen testing is unreliable on the combined oral contraceptive pill. The guideline advises that if testing is essential, the pill be withdrawn for at least three months with alternative contraception in place. This is a decision for your doctor, not one to make independently.
8. Is a fasting insulin test needed for PCOS?
The 2023 international guideline does not recommend insulin assays in routine PCOS care. The recommended metabolic assessment is an oral glucose tolerance test, with fasting glucose and HbA1c as less accurate alternatives, plus a lipid profile.
9. Does having ovarian cysts on a scan mean I have PCOS?
No. The structures seen are immature follicles rather than true cysts, and they occur in women without PCOS. The guideline specifies 20 or more follicles per ovary, or ovarian volume of 10 ml or more, in at least one ovary. A report mentioning a few follicles is not a diagnosis.
10. Can teenagers be diagnosed with PCOS?
Diagnosis in adolescents requires both hyperandrogenism and ovulatory dysfunction, and ultrasound and AMH are not used. Irregular cycles are common in the first years after menarche, so girls with some features may be classed as at increased risk and reassessed at or before 8 years post-menarche.
11. Which doctor should I see for PCOS?
A gynaecologist is the usual starting point, and an endocrinologist may be involved where hormonal or metabolic features dominate. Testing is most useful when a doctor orders the specific tests relevant to your symptoms, rather than booking a broad hormone panel on your own.
12. Where can I get PCOS-related blood tests done in Pune?
Tests such as testosterone, TSH, prolactin, AMH, fasting glucose, HbA1c and a lipid profile are available at diagnostic centres across Pune, including Fittr Labs in Kharadi, which offers home sample collection for blood tests. An ultrasound requires a centre visit, and results should be reviewed by a gynaecologist.
