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Educational draft · awaiting clinical reviewUse Rapid for revision, not patient-care decisions. Check current national and local guidance and the BNF or BNFC before acting.

Metabolic and endometrial risks of PCOS

Obstetrics and gynaecology · UK scope · Sources checked 27 Aug 2026 · Clinical review pending

RapidFull
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Investigate concerning bleeding, not the label

Persistent intermenstrual bleeding, prolonged heavy bleeding, postcoital bleeding, anaemia or a markedly thickened endometrium requires gynaecological assessment; PCOS must not be used to normalise a possible endometrial lesion.

Action: Assess haemodynamic stability and pregnancy, obtain a blood count when bleeding is significant, and arrange urgency-matched ultrasound, endometrial assessment or suspected-cancer referral according to age, pattern and risk.

Synopsis

Identify cardiometabolic, endometrial, sleep and psychological risks in PCOS, use proportionate surveillance, and prevent harm without indiscriminate screening or weight stigma.

  • PCOS increases the probability of impaired glucose tolerance and type 2 diabetes regardless of BMI; assess glycaemic status at diagnosis and repeat every one to three years according to individual risk.
  • A 75 g oral glucose tolerance test is the most accurate glycaemic assessment in PCOS, including before fertility treatment or pregnancy planning; fasting glucose or HbA1c is less accurate when an OGTT cannot be done.
  • Measure a lipid profile at diagnosis in all adults with PCOS and measure blood pressure at least annually and when planning pregnancy or fertility treatment.
  • Endometrial hyperplasia and cancer risk is increased, but absolute risk remains low and routine ultrasound or biopsy screening is not recommended in an asymptomatic person.
  • Long untreated amenorrhoea, higher weight, type 2 diabetes and persistent endometrial thickening add risk; cycle regulation, weight-inclusive health support and regular progestogen exposure reduce prolonged unopposed stimulation.
  • Screen for depression and anxiety, ask about eating disorders and body image, and assess obstructive-sleep-apnoea symptoms without assuming these concerns depend on body size alone.
  • Lifestyle care is recommended for everyone and can improve metabolic health even without weight loss; avoid implying that a single diet, exercise pattern or target weight is uniquely effective.
  • During preconception care, review blood pressure, glycaemia, medicines, nutrition, folate and comorbidities because PCOS is associated with higher pregnancy metabolic and hypertensive risk.

Key red flags

Very heavy ongoing bleeding with syncope, tachycardia, hypotension or symptomatic anaemia requires acute assessment and haemorrhage management.

Persistent intermenstrual or postcoital bleeding, a new pelvic mass or abnormal discharge should enter the relevant gynaecological investigation pathway rather than being attributed to anovulation.

Severe daytime somnolence while driving, witnessed apnoea or nocturnal choking warrants prompt sleep-disorder assessment and immediate driving-safety advice.

Suicidal thoughts, self-harm risk, severe depression or an eating-disorder medical crisis requires urgent mental-health or emergency support.

Symptoms of marked hyperglycaemia, ketosis or acute metabolic decompensation need same-day diabetes assessment rather than routine PCOS surveillance.

Investigation priorities

01
75 g oral glucose tolerance testFirst step

Detect impaired glucose tolerance or diabetes with the most accurate available glycaemic test for PCOS.

Management branches

At diagnosisBuild a baseline risk profile

Adult PCOS has been newly diagnosed or a historic diagnosis has not received structured health review.

  1. Measure blood pressure, lipid profile and glycaemic status, preferring OGTT, and document family, pregnancy and cardiovascular history.
  2. Ask about bleeding intervals, endometrial protection, mood, anxiety, eating patterns, sleep symptoms and current or future pregnancy goals.
  3. Agree a one-to-three-year glycaemic interval and result-led lipid follow-up, with annual blood pressure and a named clinician responsible for review.

Key medicines

Oral medroxyprogesterone acetateFor secondary amenorrhoea the current SmPC permits 2.5–10 mg orally once daily for 5–10 days beginning on the assumed or calculated cycle day 16–21, repeated for three cycles; longer-term PCOS spacing follows the agreed endometrial-protection plan.Exclude pregnancy and investigate concerning bleeding first; the SmPC contraindicates known, past or suspected breast cancer, previous idiopathic or current venous thromboembolism, active or recent arterial thromboembolic disease, unresolved liver disease and porphyria. Do not mistake withdrawal bleeding for restored ovulation.
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Sources and review status5 sources · checked 27 Aug 2026 · clinical review pending+
Sources

Sources and review status

National guidance is shown before implementation-dependent detail. Typical adult dose examples remain subject to patient factors, contraindications and the live BNF or specialist protocol. Source check completed 27 Aug 2026; clinical approval remains outstanding.

  • International PCOS recommendations 2023
  • RCOG PCOS long-term health information
  • NHS polyendocrine metabolic ovarian syndrome
  • Medroxyprogesterone acetate UK SmPC
  • NICE suspected cancer recommendations

Editorial contact: Doctor’s Passport editorial team. Source-check date is separate from clinical approval. Report a content problem · Content changes

Authoring stateRapid draftClinical stateAwaiting reviewJurisdictionUnited Kingdom