The scenario:
A 21 year-old individual (they/them) presents requesting a medication abortion. Their LMP was five weeks ago. They had a positive home pregnancy test three days ago, confirmed in clinic. Transvaginal ultrasound shows no visible intrauterine pregnancy (no gestational sac or yolk sac) and no signs of ectopic pregnancy. They deny pelvic pain, bleeding, or spotting since their LMP.
What’s the diagnosis?
This clinical picture is best described as a Pregnancy of Unknown Location (PUL)—a positive pregnancy test without definitive sonographic evidence of either an intrauterine or ectopic pregnancy. This is a common and expected finding when LMP is within 35 days.
Given the PUL diagnosis, can you safely prescribe medication abortion pills today?
Yes. According to Society of Family Planning (SFP) clinical guidance, medication abortion is safe and appropriate for patients with PUL who have no signs or symptoms suggestive of ectopic pregnancy. Delaying care unnecessarily, especially in restrictive legal climates, may jeopardize access to desired abortion services.
Patients should be clearly counseled on symptoms that warrant immediate evaluation, including severe abdominal pain, dizziness, or abnormal bleeding, all of which could indicate ectopic pregnancy.
What is the risk of ectopic pregnancy in this context?
Among patients presenting for abortion care with PUL, the risk that the pregnancy is ectopic ranges from 4% to 8%.
What additional follow up is appropriate to ensure a safe resolution to the pregnancy?
Close follow-up is key to confirming abortion completion and excluding ectopic pregnancy. The most accessible and clinically appropriate follow up includes:
- Baseline serum hCG on the day of mifepristone administration
- Repeat hCG in seven days
- Interpretation:
- If initial hCG ≥ 2000 mIU/mL: Evaluate further for possible ectopic pregnancy.
- If initial hCG < 2000 and follow-up shows an ≥80% decline: Pregnancy has likely resolved.
- A decline <80%: Requires additional evaluation.
This chart from SFP provides more detailed information on interpretation and follow up recommendations.
Key Points
- PUL is a routine finding in very early pregnancy and should not delay access to abortion care.
- Most asymptomatic patients with PUL can safely proceed with medication abortion.
- A structured follow-up plan—typically involving hCG measurement 7–14 days post-abortion—is key to confirm pregnancy resolution.
- All patients should receive clear guidance on warning signs of ectopic pregnancy and when to return for care.