PCOS is not identified by one result alone. The most useful PCOS hormone test examples look for a pattern: signs of raised androgens, evidence that ovulation may be irregular, and other conditions that can produce similar symptoms. When periods are unpredictable, acne persists beyond the teenage years, hair growth changes or fertility is a concern, targeted testing can turn a vague symptom picture into measurable information.
For many people, testing also needs to go beyond reproductive hormones. Polycystic ovary syndrome is closely linked with insulin resistance and longer-term cardiometabolic risk in some people, even where weight is within the expected range. A well-selected panel therefore considers hormones and metabolic markers together.
What a PCOS assessment is designed to establish
Clinical diagnosis usually follows the Rotterdam criteria. A clinician may diagnose PCOS when two of three features are present: irregular or absent ovulation, clinical or biochemical evidence of androgen excess, and polycystic ovarian morphology on ultrasound. Other causes must be excluded first.
Blood tests do not replace a clinical consultation, pelvic ultrasound or consideration of your symptoms. They can, however, provide the biochemical evidence needed to support or challenge the suspected pattern. Results are most useful when interpreted alongside cycle history, medicines, body composition, fertility goals and symptoms such as scalp hair thinning or unwanted facial hair.
PCOS hormone test examples: androgen markers
Androgens are often described as male hormones, but they are naturally present in women too. In PCOS, androgen activity may be higher than expected, contributing to acne, hirsutism, oily skin and hair loss from the scalp. Not everyone with PCOS has a clearly elevated androgen result, and not everyone with an elevated result has PCOS.
Total testosterone and free testosterone
Total testosterone measures the overall amount circulating in blood. Free testosterone estimates the smaller, biologically active proportion that is not tightly bound to proteins. Free testosterone may be particularly informative where symptoms of androgen excess are present but total testosterone is within range.
Laboratory method matters. Testosterone concentrations in women are lower than in men, so sensitive LC-MS/MS analysis is generally preferred for accurate measurement at lower levels. A result needs context: a sudden, marked elevation, especially alongside rapidly progressing hair growth, voice changes or increased muscle mass, warrants prompt medical assessment rather than assuming PCOS.
SHBG
Sex hormone-binding globulin, or SHBG, is a protein that binds testosterone and oestradiol. Lower SHBG can leave a greater proportion of testosterone available to tissues. Insulin resistance, higher insulin levels, thyroid dysfunction and some medicines can all influence SHBG.
For this reason, SHBG helps explain why someone may experience androgen-related symptoms despite a total testosterone result that appears unremarkable. It is also used alongside total testosterone to calculate a free androgen index, although this calculation has limitations at very low SHBG concentrations.
DHEA-S and androstenedione
DHEA-S is an androgen produced mainly by the adrenal glands. Androstenedione is produced by both the ovaries and adrenal glands and can be converted into testosterone or oestrogens. These markers may add useful detail when testosterone alone does not explain symptoms.
A raised DHEA-S can occur in PCOS, but it can also point towards an adrenal contribution. Interpretation should consider the degree of elevation and whether symptoms developed gradually or quickly. This is why a broader profile can be more informative than testing a single androgen in isolation.
Hormones that help assess ovulation and rule out other causes
PCOS can disrupt ovulation, but irregular periods have several possible explanations. These tests are often included because they help distinguish PCOS from other endocrine conditions requiring different care.
LH and FSH
Luteinising hormone (LH) and follicle-stimulating hormone (FSH) regulate ovarian activity. Some people with PCOS have higher LH relative to FSH, particularly early in the cycle. Yet an LH:FSH ratio is not diagnostic on its own and is no longer considered a required criterion for PCOS.
Both values vary through the menstrual cycle. If you have periods, early-cycle testing, commonly around days 2 to 5, is often preferred for baseline interpretation. If periods are absent or very infrequent, a clinician can advise on the most appropriate timing.
Oestradiol and progesterone
Oestradiol reflects ovarian hormone activity and can assist with cycle assessment. Progesterone is most useful when measured after ovulation, typically around seven days before an expected period, rather than on a fixed “day 21” for every cycle.
A low progesterone result may suggest that ovulation did not occur, but timing is critical. Testing too early or too late in the luteal phase can produce a low result even when ovulation has taken place. For irregular cycles, repeat measurements or ovulation tracking may be needed.
Prolactin, thyroid markers and 17-hydroxyprogesterone
Raised prolactin can affect periods and ovulation. Thyroid dysfunction can also contribute to irregular cycles, fatigue, weight change and changes in mood, so thyroid-stimulating hormone (TSH), and sometimes free T4, are common exclusions in a PCOS work-up.
17-hydroxyprogesterone may be used to screen for non-classic congenital adrenal hyperplasia, an inherited adrenal condition that can resemble PCOS. Depending on your history, a clinician may also consider cortisol testing or further investigations. The point is not to test every possible marker, but to select exclusions that fit your symptoms and medical history.
Metabolic tests that matter in PCOS
Insulin resistance is common in PCOS but is not universal. It can raise circulating insulin, reduce SHBG and increase ovarian androgen production. It also influences future risk of impaired glucose regulation, although risk varies substantially between individuals.
A useful metabolic assessment may include fasting glucose, fasting insulin, HbA1c and a lipid profile. Fasting insulin can provide an earlier view of insulin dynamics than glucose alone in some cases, but it is not a stand-alone diagnostic test and reference ranges differ between laboratories. HbA1c reflects average glucose exposure over roughly two to three months, while triglycerides, HDL cholesterol and other lipids help assess the wider cardiometabolic picture.
If glucose results are borderline, if there is a strong family history of type 2 diabetes, or if pregnancy is planned, a clinician may recommend an oral glucose tolerance test. This remains more sensitive than HbA1c alone for identifying impaired glucose tolerance in many people with PCOS.
When and how to test for clearer results
The best timing depends on the marker and your cycle. Baseline reproductive hormones are often measured in the early follicular phase, while progesterone needs luteal-phase timing. Fasting metabolic tests usually require an overnight fast, following the kit or laboratory instructions precisely.
Hormonal contraception, testosterone therapy, corticosteroids, thyroid medication and supplements can affect results. The combined pill can alter SHBG, androgen values, LH and FSH, making biochemical assessment of PCOS harder to interpret. Do not stop prescribed medication simply to test. Discuss whether testing while taking it is appropriate with the clinician overseeing your care.
At-home collection can make it easier to access laboratory analysis without arranging a clinic appointment. However, specimen type should fit the question being asked. Some markers are best assessed in blood, while saliva and dried urine may be useful for selected hormone patterns when the collection method and reference ranges are appropriate. Hormone Lab UK offers home testing options using professionally analysed specimens, but results should be reviewed in the context of symptoms and medical history.
What results can and cannot tell you
A normal hormone panel does not automatically exclude PCOS, particularly where clinical signs of androgen excess or ovulatory dysfunction are clear. Equally, a single high androgen result is not enough to confirm it. Results can be affected by cycle timing, stress, illness, medication, analytical method and natural biological variation.
Seek timely medical advice for very heavy bleeding, prolonged absence of periods, severe pelvic pain, possible pregnancy, milky nipple discharge, new headaches or visual changes, or rapidly worsening androgen symptoms. These features need clinical assessment rather than self-management alone.
The value of testing is not in collecting more numbers. It is in choosing markers that answer a clear question: are androgens elevated, is ovulation occurring, could another condition explain the symptoms, and is metabolic health being affected? With those answers, the next conversation about cycle care, fertility planning or long-term risk becomes far more specific.