You can get tested for PCOS at your primary care doctor’s office, an OB-GYN, or an endocrinologist. Any of these providers can order the blood work and imaging needed for a diagnosis. PCOS affects an estimated 8% to 20% of women of reproductive age, making it one of the most common hormonal conditions, yet many people go years without a diagnosis because its symptoms overlap with other issues.
Which Doctors Can Diagnose PCOS
Your primary care doctor is a perfectly reasonable starting point. They can evaluate your symptoms, order initial blood tests, and refer you to a specialist if needed. An OB-GYN is another common first stop, especially if irregular periods are your main concern. For more complex cases, or if initial treatment isn’t working, a reproductive endocrinologist specializes in hormonal disorders and can offer a more detailed workup.
Because PCOS touches so many body systems, a full care team can eventually include a dermatologist for skin and hair symptoms, a nutritionist, a mental health provider, and a fertility specialist if you’re trying to conceive. You don’t need all of these at once. Start with one provider who can run the initial tests, then build from there based on your specific symptoms.
What the Diagnostic Process Looks Like
PCOS is a diagnosis of exclusion, meaning your doctor needs to rule out other conditions that cause similar symptoms before confirming it. The current standard, known as the Rotterdam criteria, requires at least two of the following three features:
- Excess androgen activity: either visible signs like acne, thinning hair, or excess body hair, or elevated androgen levels on blood work
- Irregular or absent ovulation: typically showing up as irregular, infrequent, or missing periods
- Polycystic ovarian morphology on ultrasound: more than 20 small follicles (2 to 9 mm in diameter) in at least one ovary, or enlarged ovarian volume above 10 mL
You don’t need all three. Two out of three, combined with ruling out other causes, is enough for a diagnosis.
Blood Tests You Can Expect
A hormone panel is central to the diagnosis. Your doctor will typically check total and free testosterone levels, since elevated androgens are the hallmark of PCOS. Other hormones commonly measured include LH and FSH (two hormones that regulate your cycle), DHEA-S (an androgen produced by the adrenal glands), and sex hormone-binding globulin, a protein that affects how much testosterone is active in your body.
Beyond confirming PCOS, blood work also helps rule out conditions that look similar. Thyroid hormone levels check for hypothyroidism. A prolactin test screens for a pituitary issue that can disrupt periods. A 17-hydroxyprogesterone level helps exclude a condition called congenital adrenal hyperplasia, which causes androgen excess through a different mechanism. If your androgen levels come back very high, your doctor may investigate less common causes like adrenal or ovarian tumors or Cushing’s syndrome.
Hormone blood tests are ideally drawn early in your menstrual cycle, around days two through four, when baseline levels are most informative. If your periods are very irregular or absent, your doctor may have you take a short course of medication to induce a period first, or simply draw blood at any point.
What Happens During the Ultrasound
A transvaginal ultrasound gives the clearest picture of your ovaries. It uses a small probe inserted into the vaginal canal and takes only a few minutes. The technician or doctor measures the size of each ovary and counts the small follicles visible on the surface. Under current guidelines, more than 20 follicles measuring 2 to 9 mm in at least one ovary suggests polycystic morphology.
An abdominal ultrasound (the kind done on top of your belly) is an alternative if a transvaginal approach isn’t appropriate, such as for adolescents. It’s less precise, so doctors sometimes rely more heavily on blood work and symptom history in those cases. Keep in mind that having polycystic-appearing ovaries alone doesn’t mean you have PCOS. Many people have this ultrasound finding without the syndrome, which is why at least one other criterion is required.
Where to Go if You Don’t Have a Doctor
Community health centers and Planned Parenthood locations offer gynecological exams and can order or refer you for hormone testing. If cost is a concern, commercial labs like Quest Diagnostics sell hormone panels directly to consumers starting around $225 for a basic women’s hormone panel, plus a small physician service fee. You order online, visit a local draw site, and get results sent to you.
Some companies sell at-home hormone test kits that use finger-prick blood samples or saliva. These can measure certain hormones, but measuring androgens accurately in women is technically challenging. Even clinical labs struggle with precision at the low concentrations found in female blood, which is why guidelines recommend more advanced testing methods over standard direct assays. A home kit might flag something worth investigating, but it cannot replace a clinical evaluation. You’ll still need a provider to interpret results, perform an ultrasound, and rule out other conditions.
Why Diagnosis Often Takes Time
Many of the hallmark symptoms of PCOS, like acne, weight changes, and irregular periods, are common enough that they’re easy to dismiss, especially in teenagers whose cycles haven’t fully regulated. On average, symptoms often overlap with normal adolescent development, making it harder for providers to distinguish what’s typical from what signals PCOS.
If your concerns are brushed off, it’s reasonable to seek a second opinion or ask for a referral to an endocrinologist or reproductive endocrinologist. Going in with a record of your symptoms helps: track your periods for a few months, note any changes in hair growth or skin, and write down your questions. The more specific information you bring, the easier it is for a provider to determine whether testing is warranted and which tests to order first.