Can PCOS be diagnosed with only an ultrasound?

No. Many small follicles on a scan can appear in women without PCOS. Diagnosis needs two of three features, irregular ovulation, high androgens and the ultrasound pattern, after other causes such as thyroid problems are ruled out. These usually include a pelvic ultrasound, hormone blood tests, sugar tests, a tubal check and a semen analysis for your partner.

On which day should PCOS hormone tests be done?

LH, FSH and estradiol are usually done on day 2 to 5 of the period. If periods are absent, the doctor may test on any day or after a short course of medicine to bring on bleeding. AMH and TSH can be done any day.

Why is a sugar test needed in PCOS?

Many women with PCOS have insulin resistance, even when slim. High sugar can affect ovulation and raise pregnancy risks like gestational diabetes. Testing early allows diet, exercise or medicine to bring levels into a safe range. A higher LH than FSH can be seen in PCOS but is not needed for diagnosis.

Does my husband need to be tested if I have PCOS?

Yes. PCOS explains ovulation problems but not every fertility issue. A semen analysis is quick and low cost. Knowing both partners' results helps choose the right treatment from the start. The details depend on your dates, history and earlier reports, so your doctor will tailor the answer to you.

Is a tubal test always needed in PCOS?

Not always at the start. Some doctors begin ovulation treatment first in women with no risk factors. A tubal test is usually advised before IUI or if pregnancy does not happen after a few ovulatory cycles. Irregular periods are not always PCOS.

Do I need all these tests every cycle?

No. Most tests are done once at the start. During treatment, the main repeated test is follicular monitoring by ultrasound to check how the ovaries respond to medicine. If you have PCOS and are trying to conceive, your doctor will order tests to confirm the diagnosis, rule out other causes of irregular periods and check your overall readiness for pregnancy.

Fertility and planning

Tests Needed for PCOS-Related Infertility

Planning pregnancy with PCOS? Learn which tests confirm PCOS, rule out other causes and check sugar, thyroid, tubes and sperm before fertility treatment begins.

Written and medically reviewed by the FMC Trichy clinical team2 October 20265 min read

In this guide

Lab technician drawing a blood sample from a woman in a diagnostic room

If you have PCOS and are trying to conceive, your doctor will order tests to confirm the diagnosis, rule out other causes of irregular periods and check your overall readiness for pregnancy. These usually include a pelvic ultrasound, hormone blood tests, sugar tests, a tubal check and a semen analysis for your partner.

Why are tests needed?

Irregular periods are not always PCOS. Thyroid problems, high prolactin and other hormone issues can look similar. Testing makes sure the right condition is treated. It also checks for health issues that matter during pregnancy, such as high blood sugar.

Which tests confirm PCOS?

Pelvic ultrasound

A transvaginal scan counts the small follicles in each ovary and checks ovary size. It also looks at the uterus and lining.

Androgen tests

Blood tests for total testosterone, and sometimes free testosterone or DHEAS, show whether male-type hormones are raised.

LH and FSH

These are checked early in the cycle. A higher LH than FSH can be seen in PCOS but is not needed for diagnosis.

AMH

AMH is often high in PCOS. It supports the diagnosis and helps plan medicine doses.

Which tests rule out other causes?

TSH: to check thyroid function
Prolactin: high levels can stop periods
17-OH progesterone: to rule out a rare adrenal condition
Pregnancy test: if periods are missed

Which tests check pregnancy readiness?

Blood sugar tests

Fasting sugar, HbA1c or a 75 g glucose tolerance test check for insulin resistance or diabetes.

Lipid profile and blood pressure

These help assess long-term health risks linked to PCOS.

Vitamin D and blood count

Low vitamin D and anemia are common and easy to correct before pregnancy.

Rubella and infection screening

These are part of routine pre-pregnancy care.

Do tubes and sperm need testing too?

Yes, especially before IUI or after several failed ovulation cycles. An HSG or a special ultrasound checks if the fallopian tubes are open. A semen analysis for the partner is simple and important, since male factors can coexist with PCOS.

The essentials

The right tests save time, money and stress by pointing you straight to the right treatment. With PCOS, a careful work-up also prepares your body for a healthier pregnancy. To plan your tests in the right order, you can consult Dr Malathi G. Prasad, a fetal medicine specialist at Trichy Fetal Medicine and Fertility Centre in Trichy.

You do not have to work this out alone. our doctors see these situations every week and can guide you.

Common questions

Sources

This guide is for general information and does not replace a consultation with a fetal medicine specialist.

In line with the PCPNDT Act, we do not perform or support sex determination.

Share this guideWhatsApp

Related guides

Young woman reviewing a blood test report with a female doctor

Fertility and planning

What Is AMH and What Does It Say About Fertility?

AMH shows how many eggs remain in your ovaries, but not egg quality. Learn what high and low AMH mean, and what the test can and cannot tell you.