- 01No blood test diagnoses PCOS; the labs confirm, exclude and screen
PCOS is a diagnosis made from a pattern: two of three features (irregular ovulation, high androgens, polycystic ovaries or a high AMH) once other causes are excluded. A blood test can show one feature, high testosterone, but a normal testosterone does not rule PCOS out, and a high one can come from other conditions. The rest of the blood work exists to exclude look-alikes (TSH, prolactin, 17-hydroxyprogesterone, FSH) and to screen the metabolic risk that comes with PCOS (glucose tolerance, A1C, lipids).
- 02Polycystic ovaries and PCOS are different things
Many women without PCOS have ovaries with lots of small follicles on ultrasound, and many women with PCOS do not. The 'cysts' are partly developed egg follicles, not abnormal growths, which is one reason a 2026 global consensus renamed the condition polyendocrine metabolic ovarian syndrome (PMOS). An ultrasound report that says 'polycystic ovaries' is not a PCOS diagnosis by itself.
- 03PCOS happens at every body weight
The 2023 guideline says women with PCOS have a higher risk of impaired glucose tolerance and type 2 diabetes regardless of age and BMI, and that the glucose and lipid checks apply to all of them. Lean women get PCOS too, and they need the same metabolic screening.
Polycystic ovary syndrome (PCOS) is a long-term hormone condition in which the ovaries release eggs irregularly and the body makes more androgens, the male-type hormones such as testosterone that all women make in small amounts. It affects about 10 to 13% of women of reproductive age worldwide, and in May 2026 an international consensus renamed it polyendocrine metabolic ovarian syndrome (PMOS), because the old name wrongly suggests harmful ovarian cysts. 12 There is no single PCOS blood test: the diagnosis rests on two of three features under the 2023 international guideline, and the blood work confirms high androgens, rules out conditions that look the same, and checks blood sugar and cholesterol. 1 What to do next: if your periods are irregular or you have new excess hair growth, bring your cycle dates and any results to your clinician and ask which of the tests on this page you have had.
Symptoms of PCOS
PCOS looks different from one person to the next: some have one or two signs, others have most of them, and some notice nothing until they try to get pregnant. 34 These lists are associations to raise with your clinician, not a checklist that diagnoses PCOS.
- Periods that are irregular, infrequent (fewer than 8 a year) or stop altogether
- Extra dark hair on the face, chin, chest, belly or back (hirsutism)
- Acne on the face, chest or upper back that lasts past the teens
- Thinning hair on the top of the head
- Trouble getting pregnant
- Weight gain or difficulty losing weight
- Dark, velvety skin in the neck creases, armpits, groin or under the breasts (acanthosis nigricans)
- Skin tags in the armpits or on the neck
- Snoring with daytime sleepiness, a sign of sleep apnea
- Low mood or anxiety
- Regular-looking cycles that still do not release an egg
- Signs hidden for years by the birth control pill
Get care the same day Seek same-day care for very heavy bleeding (soaking a pad or tampon every hour for several hours), fainting, or severe pelvic pain, and for extreme thirst, frequent urination and confusion, which can signal very high blood sugar. A deepening voice, a fast spread of hair growth, or enlargement of the clitoris over weeks to months needs a prompt appointment, because an androgen-secreting tumor, though rare, can cause it. 1
Symptom lists drawn from the Office on Women's Health, CDC and the 2023 international PCOS guideline 134. Associations only, never a way to diagnose yourself.
Hirsutism is the most telling single sign. The Office on Women's Health puts it in up to 70% of women with PCOS, and the 2023 guideline says excess hair growth alone predicts high androgens on a blood test in adults. 13 Acne and scalp hair thinning on their own are weaker clues. 1 Many women find out in their twenties or thirties, when they have trouble getting pregnant, although PCOS can start at any age after puberty. 3
What is PCOS?
PCOS is the most common hormone disorder in women of reproductive age, with effects that run from adolescence past menopause. 1 Two problems sit at its center. The ovaries make more androgens than usual, which can stop them releasing an egg each cycle and cause hair growth and acne. And many women with PCOS have insulin resistance, meaning the body's cells respond poorly to insulin, the hormone that moves sugar out of the blood, so insulin levels run higher than normal. 3 The exact cause is not known; genes play a part, and the risk is higher with obesity or a mother, sister or aunt with PCOS. 3 Read more on insulin resistance and how it is measured.
How PCOS links hormones, ovulation and blood sugar
The name change matters for how you read your own reports. A May 2026 consensus in The Lancet, built on surveys of 14,360 people with PCOS and health professionals, renamed the condition polyendocrine metabolic ovarian syndrome (PMOS). 2 The paper says the old term "is inaccurate, implying pathological ovarian cysts, obscuring diverse endocrine and metabolic features, and contributing to delayed diagnosis." 2 The criteria have not changed. As Cleveland Clinic reproductive endocrinologist Mindy Christianson, MD, put it, "the diagnostic criteria for PMOS is currently the same as it was for PCOS." 14 The paper describes a transition period while health systems and disease coding catch up, so this page uses PCOS because most reports and searches still do. 2
Who gets PCOS, and what it raises the risk of
The guideline puts prevalence at 10 to 13% worldwide, broadly similar across regions and ethnic groups, possibly higher in South East Asia and the Eastern Mediterranean; the Lancet consensus describes it as one in eight women. 12 PCOS also brings risks beyond the ovaries:
| Linked problem | What the evidence says |
|---|---|
| Prediabetes and type 2 diabetes | Higher risk regardless of age and BMI; more than half of women with PCOS have diabetes or prediabetes before 40 13 |
| Heart and blood vessel disease | Considered higher risk, though overall risk before menopause is low 1 |
| Obstructive sleep apnea | Significantly more common than in women without PCOS, independent of BMI 1 |
| Depression and anxiety | High prevalence of moderate to severe symptoms; the guideline asks for screening in all adults 1 |
| Endometrial hyperplasia and cancer | Markedly higher risk before menopause, though the overall chance stays low 1 |
| Pregnancy complications | More gestational diabetes, high blood pressure in pregnancy, preterm birth and miscarriage 1 |
How PCOS is diagnosed: the 2023 criteria
Adults need two of the three features below, and other causes must be excluded first. Where irregular cycles and high androgens are both present, the diagnosis is made without an ultrasound or AMH. Teenagers need both irregular cycles and high androgens, because ultrasound and AMH are not reliable in adolescence. 1
| Criterion | What counts in adults | Notes |
|---|---|---|
| 1. Irregular cycles or no ovulation | Cycles under 21 or over 35 days, or fewer than 8 cycles a year (from 3 years after the first period); any single cycle over 90 days 1 | 1 to 3 years after the first period: under 21 or over 45 days. No period by 15 also counts. Irregular cycles in the first year are normal 1 |
| 2. High androgens | Hirsutism on exam, or a high total or free testosterone on a reliable assay 1 | Androstenedione and DHEA-S are second-line if testosterone is normal 1 |
| 3. Polycystic ovaries or high AMH | 20 or more follicles in at least one ovary on transvaginal ultrasound, or ovarian volume of 10 mL or more 1 | AMH can replace ultrasound in adults only; never use both 1 |
| Exclusions | TSH, prolactin, 17-hydroxyprogesterone and FSH; Cushing's syndrome or adrenal tumors if suspected 1 | Low LH and FSH with very low body fat or intense exercise point to a different cause 1 |
Blood tests for PCOS: what each one is for
Searches ask "will PCOS show up on a blood test?" The fair answer is that some of it will. The tests fall into three groups: those that confirm high androgens, those that rule out look-alikes, and those that screen the metabolic risk. 1 The cutoffs below are typical; your lab's printed range comes first.
| Marker | What it shows | Typical cutoff | First-line or add-on |
|---|---|---|---|
| Total testosterone | Androgen level; the main lab criterion | Premenopausal women 10 to 55 ng/dL on Labcorp's LC-MS/MS test 6 | First-line 1 |
| Free testosterone or free androgen index | The unbound, active share of testosterone | Lab-specific; calculated or by equilibrium dialysis 1 | First-line, with total 1 |
| SHBG | The protein that binds testosterone; low SHBG means more free testosterone | Lab-specific | Used to calculate free androgens |
| DHEA-S and androstenedione | Adrenal and ovarian androgens | Lab- and age-specific | Add-on if testosterone is normal 1 |
| AMH | Follicle count stand-in | Age- and assay-specific 1 | Adults only, instead of ultrasound 1 |
| TSH | Thyroid function | Lab range | Exclusion, first-line 1 |
| Prolactin | Pituitary hormone that can stop periods | Lab range | Exclusion, first-line 1 |
| 17-hydroxyprogesterone | Screens for non-classic CAH | Early-morning value over 200 ng/dL prompts more testing 8 | Exclusion, first-line 15 |
| FSH and LH | Pituitary signals to the ovaries | Lab range | Exclusion of early menopause or low-signal causes 1 |
| OGTT 2-hour glucose | Blood sugar handling | 140 to 199 mg/dL is impaired glucose tolerance 9 | Preferred glucose test in PCOS 1 |
| HbA1c and fasting glucose | Average and fasting blood sugar | A1C 5.7 to 6.4%; fasting 100 to 125 mg/dL is prediabetes 9 | If an OGTT is not possible 1 |
| Triglycerides and HDL | Lipid profile | Lab and risk-based targets | At diagnosis for all 1 |
| Fasting insulin and HOMA-IR | Insulin resistance estimate | No agreed cutoff | Not recommended in routine care 1 |
Two practical points change results more than most people expect. The guideline says testosterone should be measured with LC-MS/MS, because direct immunoassays "have limited accuracy and demonstrate poor sensitivity and precision" at female levels. 1 And the combined birth control pill raises SHBG and lowers ovarian androgen output, so androgens cannot be read reliably on the pill; if testing is essential, the guideline describes stopping it for at least 3 months with other contraception, a decision for you and your prescriber. 1 For androgen tests, the Endocrine Society also suggests an early-morning sample. 5 If your report gives total testosterone, SHBG and albumin, the free testosterone calculator estimates the free fraction.
Where an example total testosterone of 68 ng/dL falls for a premenopausal womanng/dL
How the PCOS blood tests read together
| Pattern | What it usually means |
|---|---|
| Irregular cycles, mildly high testosterone, low SHBG, normal TSH, prolactin and 17-OHP | Fits PCOS; no ultrasound or AMH needed 1 |
| Irregular cycles, normal testosterone, high AMH or 20+ follicles per ovary (adult) | Fits PCOS without high androgens 1 |
| Hirsutism and regular cycles, normal androgens, normal ultrasound | Does not meet PCOS criteria; the Endocrine Society suggests against androgen testing for local hair growth with regular cycles and no abnormal hirsutism score 5 |
| High early-morning 17-OHP (over 200 ng/dL) | Possible non-classic CAH; usually followed by an ACTH stimulation test 78 |
| High prolactin with irregular or absent periods | A pituitary or medicine cause, managed differently from PCOS 1 |
| High TSH with irregular periods | Possible hypothyroidism, which can disturb cycles 1 |
| Testosterone far above range, or symptoms that changed fast | Look for an androgen-secreting tumor or Cushing's syndrome 1 |
| Low LH and FSH, low estrogen, very low body fat or heavy training | Hypothalamic amenorrhea, a different diagnosis 1 |
| Normal fasting glucose but 2-hour OGTT 140 to 199 mg/dL | Impaired glucose tolerance that an A1C or fasting test can miss 19 |
An LH (luteinizing hormone) level higher than FSH (follicle-stimulating hormone) is common in PCOS, but the 2023 guideline does not use the LH-to-FSH ratio as a criterion; the two hormones appear in the workup to exclude other causes of missed periods. 1 Fasting insulin and HOMA-IR are popular, yet the guideline says insulin resistance is part of PCOS while "clinically available insulin assays are of limited clinical relevance and are not recommended in routine care." 1 If you already hold a fasting insulin and glucose, the HOMA-IR calculator turns them into a score, and the insulin resistance guide explains why no single cutoff exists.
Testosterone 50, 60 or 80 ng/dL in a woman, and other PCOS numbers
These readings use Labcorp's LC-MS/MS range for premenopausal women and the ADA's glucose cutoffs; your own lab's range overrides them. 69
- Total testosterone of 50 ng/dL: inside the premenopausal range of 10 to 55 ng/dL. A normal total does not rule PCOS out, since free testosterone can still be high when SHBG is low, and hirsutism alone counts as high androgens. 16
- Total testosterone of 60 or 80 ng/dL: above the range, by a small to moderate margin. That size of rise fits PCOS, and the cause is pinned down with cycle history, 17-OHP, prolactin and TSH. 16
- A testosterone far above the lab's range: the guideline lists ovarian and adrenal tumors, CAH and Cushing's syndrome among the causes to consider, and notes that the history of fast onset matters as much as the number. 1
- 17-OHP under 200 ng/dL (early morning, first half of the cycle): non-classic CAH less likely; over 200 ng/dL: further evaluation, usually an ACTH stimulation test. 78
- A1C of 5.7 to 6.4%: prediabetes range; 6.5% or higher: diabetes range, confirmed by a second test. 9
- 2-hour OGTT glucose of 140 to 199 mg/dL: impaired glucose tolerance; 200 mg/dL or higher: diabetes range. 9
Conditions that look like PCOS
Because PCOS is a diagnosis of exclusion, ruling out the look-alikes is a core part of the workup. The guideline's exclusion list is TSH, prolactin, 17-hydroxyprogesterone and FSH, plus checks for Cushing's syndrome and adrenal tumors when the picture suggests them. 1
| Look-alike | What overlaps | The test that tells them apart |
|---|---|---|
| Non-classic congenital adrenal hyperplasia (CAH) | Hirsutism, acne, irregular periods; about 1 in 1,000 people, up to 1 in 30 Ashkenazi Jewish people 8 | Early-morning 17-OHP by LC-MS/MS, then ACTH stimulation if borderline 7 |
| Hypothyroidism | Irregular periods, weight gain, tiredness | TSH, then free T4 1 |
| High prolactin (hyperprolactinemia) | Missed periods, sometimes breast milk discharge | Prolactin 1 |
| Cushing's syndrome | Weight gain, hirsutism, high blood sugar, irregular periods | Cortisol screening tests chosen by the clinician 1 |
| Androgen-secreting tumor of the ovary or adrenal | Hirsutism and high androgens, often fast-moving with a deepening voice | Very high testosterone or DHEA-S, then imaging 1 |
| Hypothalamic amenorrhea | Missed periods | Low LH and FSH with low body fat or intense exercise 1 |
| Premature ovarian insufficiency | Irregular or stopped periods before 40 | High FSH 1 |
Endometriosis vs PCOS: pain points to endometriosis, irregular cycles to PCOS
What can help PCOS: the evidence, graded
PCOS is long-term; the guideline calls the diagnosis lifelong, and care is aimed at the features that matter most to each person: cycles, hair and skin, fertility, weight, mood and long-term metabolic risk. 1 Lifestyle comes first in the guideline, with medicines chosen by the clinician for the specific goal. Prescription options appear below as facts; choosing among them is the clinician's job, with you.
| Approach | What the evidence shows | Strength | Cautions |
|---|---|---|---|
| Healthy eating and physical activity | Recommended for all women with PCOS for metabolic health, including central fat and lipids; benefits occur even without weight loss; no single diet type beats another 1 | Moderate | Weight stigma is common; the guideline says goals are co-developed with each woman 1 |
| Combined oral contraceptive pill | Could be recommended in adults for hirsutism and irregular cycles 1 | Moderate | Usual pill contraindications apply; masks androgen tests 1 |
| Metformin (prescription) | Should be considered in adults with BMI 25 or more for weight and metabolic outcomes; similar efficacy to active lifestyle change; preferred over the pill for metabolic goals 1 | Moderate | Stomach upset common; may lower vitamin B12 with long use 1 |
| GLP-1 medicines and other anti-obesity drugs (prescription) | Could be considered with lifestyle change for higher weight, as for the general population 1 | Moderate | Effective contraception needed; weight returns after stopping 1 |
| Letrozole (prescription, for fertility) | First-line medicine to trigger ovulation in women with PCOS who are not ovulating 1 | Strong | Off-label in many countries; pregnancy must be excluded first 1 |
| Anti-androgen medicines (prescription) | Could be added for hirsutism after at least 6 months of the pill or cosmetic treatment 1 | Limited | Need reliable contraception because of risks to a male fetus 1 |
| Inositol (supplement; no LifeFrom guide) | Possible improvement in some metabolic measures, limited benefit for ovulation, hair growth or weight; evidence "limited and inconclusive" 110 | Limited | Experimental for fertility; tell your clinician if you use it 1 |
| Vitamin D (supplement) | A 2023 meta-analysis of 20 small trials found higher ovulation and pregnancy rates, but the study quality was low 11 | Limited | Trials were small and of limited quality 11 |
| Omega-3 (supplement) | A 2018 meta-analysis of 9 trials (591 women) found small improvements in HOMA-IR and cholesterol 12 | Limited | Small, short trials |
Searches for "PCOS treatment for infertility" and "birth control pills for PCOS" are some of the largest around this condition. On fertility, the guideline's first-line medicine is letrozole, graded on high-certainty evidence, and it says those with PCOS "should be reassured that pregnancy can often be successfully achieved either naturally or with assistance." 1 Fertility treatment, including timing, is planned with a fertility specialist; LifeFrom's fertility page covers the wider picture. On the pill, the guideline treats it as an option for hair growth and cycles, not a fix for metabolic risk, which is where lifestyle change and metformin come in. 1
Monitoring and retesting with PCOS
| What is checked | How often (2023 guideline) | Why |
|---|---|---|
| Glucose status (OGTT preferred, or A1C and fasting glucose) | At diagnosis, then every 1 to 3 years based on risk 1 | Higher type 2 diabetes risk at any weight; see prediabetes and type 2 diabetes |
| OGTT before pregnancy | When planning pregnancy or fertility treatment, and at 24 to 28 weeks of pregnancy 1 | High risk of gestational diabetes |
| Lipid profile | At diagnosis, then by risk 1 | Cholesterol and triglycerides often abnormal; see metabolic syndrome |
| Blood pressure | Every year, and before pregnancy 1 | Higher risk of high blood pressure, especially in pregnancy |
| Mood (depression and anxiety screening) | At diagnosis; the best interval is not known 1 | High prevalence of moderate to severe symptoms |
| Sleep apnea symptoms | Ask about snoring and unrefreshing sleep 1 | More common, independent of BMI |
| Vitamin B12 | Consider on long-term metformin with other risk factors 1 | Metformin can lower B12 |
| Androgens | Repeat measures have a limited role once diagnosed 1 | Symptoms guide care better than repeated testosterone |
The blood sugar guide explains how the OGTT, A1C and fasting glucose differ, and why a trend over years says more than one result.
When to see a doctor
Outside those red flags, see a clinician for cycles that stay irregular more than a year after your first period, no period by age 15, unwanted hair growth, persistent acne, or trouble getting pregnant. 1 The ADA lists PCOS among the risk factors for diabetes screening in adults with overweight or obesity, so a PCOS diagnosis is also a reason to ask about glucose testing. 94
Questions to ask your clinician
- Which of the three PCOS criteria do I meet, and how was each one measured?
- Was my testosterone measured by LC-MS/MS, and was I on hormonal contraception at the time?
- Have TSH, prolactin, 17-hydroxyprogesterone and FSH been checked to rule out look-alikes?
- Should my blood sugar be checked with an oral glucose tolerance test rather than A1C alone?
- When should my lipids, blood pressure and glucose be rechecked?
- Which treatment fits my main goal right now: cycles, hair and skin, fertility or metabolic health?
- If I am planning a pregnancy, what should happen before I start trying?
Related reading: the insulin resistance guide, metabolic syndrome, the testosterone and AMH marker pages, and how to read any lab result. This page is general education, not medical advice or a diagnosis. The clinician who knows your history reads your results and makes decisions with you.
Educational only: LifeFrom explains lab results and does not diagnose or treat PCOS. Very heavy bleeding, fainting, severe pelvic pain, or extreme thirst with confusion needs same-day care, and a deepening voice or fast-spreading hair growth needs a prompt appointment. Find the cause with a clinician before starting anything, including supplements.
Citations
- Teede HJ, Tay CT, Laven JJE, et al. Recommendations from the 2023 international evidence-based guideline for the assessment and management of polycystic ovary syndrome. J Clin Endocrinol Metab. 2023;108(10):2447-2469.
- Teede HJ, Khomami MB, Morman R, et al; Global Name Change Consortium. Polyendocrine metabolic ovarian syndrome, the new name for polycystic ovary syndrome: a multistep global consensus process. Lancet. 2026;407(10545):2329-2339.
- Office on Women's Health, US Department of Health and Human Services. Polycystic ovary syndrome.
- Centers for Disease Control and Prevention. Diabetes and polycystic ovary syndrome (PCOS). Updated May 2024.
- Martin KA, Anderson RR, Chang RJ, et al. Evaluation and treatment of hirsutism in premenopausal women: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2018;103(4):1233-1257.
- Labcorp. Test 070001: Testosterone, total, women, children, and hypogonadal males, LC/MS-MS. Reference intervals.
- Speiser PW, Arlt W, Auchus RJ, et al. Congenital adrenal hyperplasia due to steroid 21-hydroxylase deficiency: an Endocrine Society clinical practice guideline. J Clin Endocrinol Metab. 2018;103(11):4043-4088.
- Trapp CM, Oberfield SE. Recommendations for treatment of nonclassic congenital adrenal hyperplasia (NCCAH): an update. Steroids. 2012;77(4):342-346.
- American Diabetes Association Professional Practice Committee. 2. Diagnosis and classification of diabetes: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1):S27-S49.
- Fitz V, Graca S, Mahalingaiah S, et al. Inositol for polycystic ovary syndrome: a systematic review and meta-analysis to inform the 2023 update of the international evidence-based PCOS guidelines. J Clin Endocrinol Metab. 2024;109(6):1630-1655.
- Yang M, Shen X, Lu D, et al. Effects of vitamin D supplementation on ovulation and pregnancy in women with polycystic ovary syndrome: a systematic review and meta-analysis. Front Endocrinol. 2023;14:1148556.
- Yang K, Zeng L, Bao T, Ge J. Effectiveness of omega-3 fatty acid for polycystic ovary syndrome: a systematic review and meta-analysis. Reprod Biol Endocrinol. 2018;16(1):27.
- Office on Women's Health, US Department of Health and Human Services. Endometriosis.
- Cleveland Clinic. PCOS becomes PMOS: what's changing? Ob/Gyn Time podcast with Mindy Christianson, MD, and Erica Newlin, MD.
Educational context only, not medical advice or a diagnosis. Always discuss your results with a clinician.
