Pregnancy of unknown location — safety-netting 🚨 🩺
🧠 Clinical mechanism: A positive pregnancy test with no visible intrauterine or extrauterine pregnancy on scan may represent a very early pregnancy, failing pregnancy or ectopic pregnancy.
🔎 Recognise
- Positive test, pain or bleeding with nondiagnostic ultrasound; an initially low hCG does not exclude tubal rupture.
🛟 First assessment and action
- Arrange early pregnancy/gynaecology review; if unstable use emergency haemorrhage pathway. Provide explicit 24-hour return instructions.
🧪 Investigations and reassessment
- Transvaginal ultrasound and serial serum hCG near 48 hours apart, interpreted with symptoms and specialist review.
⚠️ Pitfall / escalation
- Serum hCG cannot locate a pregnancy; worsening pain or syncope overrides a reassuring numerical trend.
UK reference: Primary NHS/NICE/RCOG/GMC source.
Editorial draft, 7 November 2026: targeted source-supported educational summary, NOT independent consultant/pharmacist verification or a treatment protocol. Follow up-to-date BNF, NICE and local NHS pathways.
Related: Ectopic Pregnancy · Ectopic pregnancy — FY quick guide 🚨 🤰 · Anti-D immunoglobulin 💊