How Is PCOS (PMOS) Diagnosed? The Tests You Should Actually Ask For

How is PCOS diagnosed? Often too late, because the workup is incomplete. A lot of people go years with PCOS, now officially called PMOS, without a diagnosis. Often it’s because the workup was a couple of basic labs, a quick ultrasound, and “everything looks normal.” Knowing what a real workup includes lets you ask for it.

Here’s the short version. In adults, PCOS is diagnosed when two of three features are present: signs of higher androgens, irregular or absent ovulation, and polycystic-appearing ovaries on ultrasound or a high AMH. There’s no single test, and the workup should also rule out other conditions and check your metabolic health. This is education, not a way to self-diagnose. Your provider makes the call.

What are the criteria for diagnosing PCOS?

The 2023 international guideline uses the Rotterdam criteria, two of these three:

1. Higher androgens, either on a blood test or visible signs like acne, excess hair growth, or hair thinning.
2. Ovulatory dysfunction, meaning irregular, infrequent, or absent periods or ovulation.
3. Polycystic ovarian morphology on ultrasound, or in adults an elevated AMH.

The name changed to PMOS in May 2026, but the criteria didn’t. (See the name change post.) If you have irregular cycles and higher androgens, the guideline says you don’t need an ultrasound or AMH for the diagnosis.

What blood tests are part of a PCOS workup?

• Androgens. First-line is total testosterone and free testosterone (or a free androgen index). The guideline calls for accurate methods, specifically mass spectrometry, since standard immunoassays are unreliable at the low levels seen in women. If testosterone is normal, DHEAS and androstenedione can add information.
• Tests to rule out look-alikes. Thyroid (TSH), prolactin, and 17-hydroxyprogesterone, because other conditions can mimic PCOS. A true diagnosis is one where those have been ruled out.
• AMH. In adults it can stand in for the ultrasound finding. It’s a piece of the picture, not a stand-alone test.

Lab reference ranges vary widely and can include people who have PCOS, so “in range” isn’t always the end of the story. (See normal isn’t the same as optimal.)

What metabolic testing should come with a diagnosis?

This is the part that gets skipped most, and it’s why the name changed.

What I run: a fasting insulin level and a HOMA-IR calculation (which combines fasting insulin and fasting glucose to estimate insulin resistance) on every suspected PMOS client. One blood draw, inexpensive, and it shows what fasting glucose alone hides. Neither is part of the formal diagnostic criteria, so I use them as context for the plan, not as the diagnosis.

What the 2023 guideline recommends:

• A 75 g oral glucose tolerance test at diagnosis and before fertility treatment, repeated every one to three years.
• A lipid panel at diagnosis.
• Blood pressure checks every year, and when planning pregnancy.
• Screening for depression and anxiety.

Those aren’t in conflict. Both are ways of looking past a normal fasting glucose. Ask your provider which they use and how they’ll act on it. (See the insulin resistance post.)

Can you be diagnosed without an ultrasound?

Yes, if you have irregular cycles and higher androgens. It’s also one reason lean and “regular-cycle” cases get missed, because providers over-rely on imaging or on weight. (See the lean PCOS post.)

For adolescents, the guideline is stricter: both irregular cycles and higher androgens, and it advises against ultrasound or AMH because they’re less specific in teens.

Why do so many people get missed?

Because the pieces get checked separately. One client was getting ready for an embryo transfer, and nearly all the attention was on her partner’s cycle. When we actually talked, she barely drank any water, hit a wall every afternoon, and had felt off since stopping birth control pills six months earlier. Separately, none of that raised a flag. Together, it was a pattern. When we ran her testing, she met the criteria. (I tell the full story in the insulin resistance post.)

An estimated 70% of people with PCOS are never diagnosed. A workup that looks at everything at once is how that changes.

What should I bring to the appointment?

• A written cycle history: how long your cycles run, how often you skip, and for how long.
• A list of symptoms, including skin, hair, energy, cravings, and mood.
• Your prior labs, so nothing gets repeated or read in isolation.
• This list of tests, and the question: “Has PCOS actually been ruled out, or assumed away?”

How is PCOS diagnosed, in short?

How is PCOS diagnosed, in short? Two of three features, the right labs, and the other conditions ruled out. If you’re wondering how is PCOS diagnosed in your own case, bring your cycle history and prior labs so the pieces get read together. That’s the short answer to how is PCOS diagnosed, and the rest of this series builds on it. If you’re asking how is PCOS diagnosed for you, that’s what I help clients untangle.

Get the full picture, not one lab at a time

If you’ve been told “your labs are normal” and you still feel off, that’s what I help clients sort through. We pull it all together and decide what’s worth asking for.

Start with the Fertility Pattern Assessment. A few minutes, no pressure, and it’ll help you see where to focus first.

Frequently asked questions

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About the author

Jessica Boone, PA-C is a fertility and IVF strategist with more than a decade of experience across both male and female infertility, which makes her a bit of a unicorn in a field that usually treats the two as separate problems. For years she’s been the person friends, family, and clients call when they’re lost in the fertility system. Through Fortitude Fertility Consulting, she builds the strategy couples are rarely given the time to build, so they stop saying yes to whatever’s next and start making real decisions about their care. Fortitude offers strategy and education, not medical care.