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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.

Ovarian cancer symptoms, CA125 and imaging

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

RapidFull
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Obstruction, thrombosis and respiratory compromise need acute care

Advanced ovarian cancer may present with bowel obstruction, massive ascites or pleural effusion, venous thromboembolism, sepsis, acute kidney injury or a painful torsion-like adnexal emergency.

Action: Assess airway, breathing, circulation, abdomen, urine output and thromboembolic features; stabilise, obtain urgent imaging and surgical or oncology review, and drain or decompress only through an indication-led specialist plan.

Synopsis

Recognise persistent ovarian-cancer symptom patterns and apply the April 2026 age-specific CA125, ultrasound, RMI and tissue-diagnosis pathway without false reassurance or indiscriminate screening.

  • The symptom signal is persistence and frequency, not one dramatic episode: distension, early satiety or appetite loss, pelvic or abdominal pain, and urinary urgency or frequency are key patterns, especially after age 50.
  • NICE NG12 changed in April 2026: age 39 or under with persistent suggestive symptoms should not be managed with CA125 alone; consider urgent direct-access ultrasound of abdomen and pelvis.
  • At age 40 or over, measure CA125 and use age-specific ultrasound thresholds: 35 IU/ml at 40–49, 31 at 50–59, 24 at 60–69, 25 at 70–79 and 31 at 80 or over.
  • These thresholds decide urgent ultrasound in symptomatic primary-care assessment; they are not universal normal ranges and do not diagnose cancer.
  • If ultrasound suggests ovarian cancer, refer through the suspected-cancer pathway. If CA125 is below the age threshold or ultrasound is normal, investigate other causes and safety-net increasing or persistent symptoms.
  • CA125 rises with many benign or non-ovarian conditions and can be low in early cancer; never use it as a population screening test or as the sole rule-out result.
  • In secondary care, ultrasound is the initial imaging study, RMI I equals ultrasound score multiplied by menopausal score and CA125, and a score of 250 or more warrants specialist MDT referral.
  • When CA125, ultrasound and clinical status suggest malignancy, CT abdomen and pelvis maps extent, adding thorax when indicated; histological diagnosis is expected before cytotoxic chemotherapy except in exceptional MDT-agreed circumstances.

    • Key red flags

    Ascites or a pelvic or abdominal mass on examination that is not obviously uterine fibroids requires a suspected-cancer pathway referral without waiting for a CA125 result.

    Persistent abdominal distension, early satiety, pelvic or abdominal pain, or urinary urgency and frequency occurring particularly more than twelve times monthly needs ovarian-cancer testing.

    New symptoms resembling irritable bowel syndrome at age 50 or over should trigger ovarian-cancer assessment because first presentation of IBS is uncommon at that age.

    Vomiting, absolute constipation, abdominal distension and colicky pain suggest bowel obstruction and require same-day surgical and oncology assessment.

    Unilateral leg swelling, sudden breathlessness, chest pain, hypoxia or haemoptysis suggests cancer-associated thrombosis and needs emergency investigation.

    Investigation priorities

    01
    Serum CA125 in primary careFirst step

    Guide urgent ultrasound in symptomatic people aged 40 or over using the current age-specific thresholds.

    Management branches

    Primary-care detectionUse age and pattern together

    A person presents with new persistent or frequent abdominal, appetite, pelvic or urinary symptoms suggestive of ovarian cancer.

    1. Quantify symptom frequency and progression, examine for ascites or a mass and refer immediately if either examination finding is present.
    2. At 39 or younger consider urgent direct-access ultrasound without relying on CA125 alone; at 40 or older measure CA125 and apply the exact age-band threshold for ultrasound.
    3. Refer a suspicious ultrasound through the cancer pathway, or investigate alternative causes and provide explicit return triggers when CA125 is below threshold or ultrasound is normal.
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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. Apply principles in context and verify current guidance when a decision affects care. Source check completed 27 Aug 2026; clinical approval remains outstanding.

    • NICE NG12 ovarian referral recommendations
    • NICE CG122 ovarian cancer diagnosis
    • NICE RMI I calculation appendix
    • BGCS ovarian cancer guideline update 2024
    • BGCS ovarian genetic testing consensus

    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