How Is PMOS (PCOD/PCOS) Diagnosed? The Tests and Scans Doctors Use

By Femly Health Editorial Team · 10 November 2026

There is no single test for PMOS (PCOD/PCOS). A doctor diagnoses it by looking at three things: your period pattern, signs of high male hormones (androgens), and sometimes an ovary scan or AMH blood test. You need at least two of the three. Doctors also check for other conditions that look similar.

Is there one test that confirms PMOS?

No. Many women expect one blood test or one scan to give a yes or no answer. PMOS does not work that way.

Doctors use a method called the Rotterdam criteria. The 2023 international guideline says an adult needs at least two of three features: signs of high androgens, irregular ovulation, and polycystic ovary shape on a scan or high AMH. Other causes must be ruled out first.

A quick word on the name. In May 2026, a global group of doctors and patients renamed polycystic ovary syndrome to polyendocrine metabolic ovarian syndrome (PMOS). It is the same condition. The new name shows that PMOS affects hormones and metabolism, not just the ovaries.

What are the three things a doctor checks?

Each feature has its own way of being checked. The table below puts them side by side.

Irregular periods

For an adult, the guideline counts periods as irregular if the gap is shorter than 21 days or longer than 35 days. Having fewer than eight periods in a year also counts. Your doctor will ask when your last few periods came.

If you want to know more about what causes this, read our guide on irregular periods and their causes.

High androgen signs

Your doctor will look for thick dark hair on the face, chest or belly, acne that keeps coming back, and thinning hair on the scalp. These are called clinical signs. A blood test for testosterone can also show raised androgens.

Jawline acne is a common sign. Our article on hormonal acne in women explains when it points to a hormone problem.

Polycystic ovary pattern

This means the ovaries hold many small follicles. They are not true cysts or tumours. They are tiny fluid sacs that hold immature eggs.

Which blood tests do doctors ask for?

Blood tests do two jobs. They check for high androgens, and they rule out other conditions that can look like PMOS. Your doctor will choose the tests that fit your symptoms.

Tests that are often asked for include:

• Testosterone: to check for raised androgens, especially if the signs are not clear.
• TSH: to check your thyroid, because thyroid problems can cause irregular periods too.
• Prolactin: to check for high prolactin, which can stop or delay periods.
• 17-hydroxyprogesterone: to rule out a rare adrenal condition that can look like PMOS.

One clinical review explains that thyroid disease, high prolactin and this adrenal condition can look identical to PMOS. That is why these tests matter.

You can read more about the two most common look-alikes in our articles on PMOS and thyroid and high prolactin.

Tests for your metabolic health

PMOS is linked with insulin resistance, which means your body does not respond well to insulin. Many doctors also check blood sugar, cholesterol and blood pressure. These tests are not used to diagnose PMOS. They help your doctor see your wider health.

Our guide on insulin resistance in women covers the signs and an Indian plate that supports blood sugar.

Do you need an ultrasound or an AMH test?

Not always. The guideline says that when you have both irregular periods and high androgen signs, a scan or AMH test is not needed to make the diagnosis. Your doctor may still order one for other reasons.

A scan or AMH test becomes useful when only one of the other two features is clear. For example, you may have irregular periods but no visible hair growth or acne. Then the ovary pattern can help complete the picture.

The 2023 guideline now allows an AMH blood test as an alternative to ultrasound in adults. AMH is a hormone made by the small follicles. Women with PMOS often have a higher level.

AMH levels change with age, and labs use different cut-offs. So your doctor reads the number with your other findings. If you have had a low AMH result, see our article on what low AMH means.

How is PMOS diagnosed in teenagers?

Teen cycles take time to settle after the first period. Irregular periods in the first year or two are common and may be normal. Because of this, doctors are careful about labelling a teenager too early.

The guideline says a pelvic ultrasound should not be used to diagnose PMOS in the first eight years after the first period. Many healthy teens have ovaries with many follicles at this age. Doctors rely on period patterns and androgen signs instead.

If your daughter has very irregular periods, severe acne or hair growth, a doctor can evaluate her. She may be advised to come back for a review later rather than get a label right away.

Can you have PMOS with regular periods, or if you are thin?

Yes, in some cases. Since only two of three features are needed, a woman may have high androgen signs and a polycystic ovary pattern while her periods look fairly regular. A doctor will decide based on her tests.

PMOS also affects women who are slim. Our article on lean PMOS explains why weight does not decide the diagnosis.

PMOS is also common in India. A meta-analysis of Indian studies estimated that about 11 in 100 women have it. The same paper notes that India still needs better-designed studies, so the true number may differ.

How can you get ready for your appointment?

A little preparation helps your doctor reach a clear answer faster. Try these steps before you go:

1. Write down the start date of your last six to twelve periods. A period tracker app works well.
2. Note symptoms such as acne, hair growth, hair fall, tiredness and mood changes.
3. List any medicines, hormonal pills or supplements you take. Any change to them is a decision for your doctor.
4. Carry old reports, scans and blood tests.
5. Write your questions down, including any about pregnancy plans.

If you want a doctor to look at your symptoms, you can book an online doctor consultation for women with Femly. A Femly doctor can evaluate your concerns and guide you on which tests may be useful.

What happens after a PMOS diagnosis?

A diagnosis is a starting point. Your doctor will talk about your symptoms and goals, such as regular periods, skin and hair, or pregnancy. Medical care is chosen for each woman, and your doctor decides which medicines, if any, you need.

Food, movement, sleep and stress habits can support your symptoms alongside medical care. They do not replace it. The usual focus is steady meals, regular movement, good sleep and ways to manage stress. These support how you feel day to day, and results differ from woman to woman.

At Femly, clinical dietitians and doctors work together on nutrition and lifestyle guidance. The PMOS (PCOD/PCOS) Care Program offers this kind of support. It begins with a look at your own profile, and it works alongside your doctor's care.

You can also explore more in our PMOS (PCOD/PCOS) hub.

When to see a doctor

See a doctor, ideally a gynaecologist, if you notice any of these:

• Your periods are often longer than 35 days apart, or you have fewer than eight periods in a year.
• You miss several periods in a row and you are not pregnant.
• You have new facial or body hair, or acne that does not settle.
• You have been trying to get pregnant for some time without success.
• You have very heavy bleeding, severe pelvic pain, or feel dizzy and very tired during periods.
• Your teenage daughter has no periods by age 15, or her periods stay very irregular after a few years.

Do not wait for a scan to show cysts. Your symptoms are reason enough to get checked. A doctor can order the right tests and explain what they mean for you.

Frequently asked questions

How is PCOS diagnosed in India?

Doctors in India use the same Rotterdam criteria as elsewhere. You need two of three features: irregular periods, signs of high androgens, and a polycystic ovary pattern on a scan or high AMH. Blood tests such as TSH and prolactin rule out other causes.

Can PMOS be diagnosed without an ultrasound?

Yes. If you have irregular periods and signs of high androgens, such as hair growth or acne, a scan is not needed for the diagnosis. Your doctor may still ask for one to see your ovaries or check other concerns.

Does having cysts on the ovaries mean I have PMOS?

No. Many healthy women have ovaries with many small follicles. PMOS is diagnosed by looking at your periods, androgen signs and tests together, not by the scan alone.

Which blood tests are done to check for PCOS?

Doctors often ask for testosterone, TSH, prolactin and sometimes 17-hydroxyprogesterone. Some also check blood sugar and cholesterol. Your doctor chooses the tests based on your symptoms.

Is AMH test enough to diagnose PCOS?

No. The 2023 guideline allows AMH as an alternative to ultrasound for the ovary feature in adults. It still needs to be read along with your periods and androgen signs, and other causes must be ruled out.

Can you have PMOS and still get regular periods?

In some cases, yes. Only two of the three features are needed, so a woman can have high androgen signs and a polycystic ovary pattern while her periods look fairly regular. A doctor will decide after looking at her tests.

At what age can PCOS be diagnosed?

It can be diagnosed in adults at any age after the teen years. In teenagers, doctors are more careful because cycles take time to settle. A scan is not advised in the first eight years after the first period.

Do I need to fast or go on a particular day of my cycle for PCOS tests?

It depends on the test. Some hormone tests are best done at a certain point in your cycle, and blood sugar tests may need fasting. Ask your doctor or the lab before you go.

Can thyroid problems look like PCOS?

Yes. Thyroid problems can cause irregular periods, weight changes and hair fall, just like PMOS. That is why a TSH test is part of the check-up. The two conditions can also happen together.

Should I see a gynaecologist or an endocrinologist for PCOS?

A gynaecologist is a good first step for period problems, scans and pregnancy plans. Some women are also referred to an endocrinologist for hormone or blood sugar concerns. A Femly doctor can evaluate your symptoms and guide you on the next step.