Synopsis
Manage a positive pregnancy test with no pregnancy seen on ultrasound as a temporary high-risk state until location and outcome are established safely.
- Pregnancy of unknown location is an ultrasound classification: the pregnancy test is positive but transvaginal ultrasound shows neither definite intrauterine nor definite extrauterine pregnancy.
- Possible outcomes are an early viable intrauterine pregnancy, a failing intrauterine pregnancy that has not been documented, or an ectopic pregnancy; the label is not a final diagnosis.
- Assume ectopic pregnancy remains possible until location is established or follow-up demonstrates complete resolution.
Key red flags
Haemodynamic instability, collapse, pallor, tachycardia, hypotension or peritonism requires direct emergency care and resuscitation rather than outpatient serial testing.
Investigation priorities
Search for a definite intrauterine pregnancy, adnexal ectopic features and haemoperitoneum with the most sensitive early approach.
Management branches
A patient with PUL develops haemodynamic change, severe pain, peritonism, syncope or significant bleeding.
- Activate ABCDE care, two large-bore cannulas, urgent bloods and group-and-save or crossmatch, analgesia and senior gynaecology and anaesthetic support.
- Use bedside or urgent formal imaging only if it does not delay definitive control; free fluid plus shock is enough to prioritise emergency surgery.
The patient is clinically stable and ultrasound meets the definition of PUL.