What percentage of patients with ectopic pregnancy will have normally rising hCG levels?

Explanation

Core Concept: In a normal intrauterine pregnancy, beta-hCG levels typically double every 48-72 hours. In ectopic pregnancies, hCG levels usually rise abnormally slowly or plateau. However, a small percentage of ectopic pregnancies can present with normally rising hCG levels, making ultrasound correlation critical.

Clinical Presentation:

• Unilateral abdominal/pelvic pain, vaginal spotting, and signs of rupture (shoulder pain, hypotension) if advanced.

Diagnosis:

• *First-line:* Serial quantitative beta-hCG levels and transvaginal ultrasound.
• *Gold Standard:* Transvaginal ultrasound showing an adnexal mass with a yolk sac or fetal pole, or an empty uterus with hCG above the discriminatory zone.

Management:

• *Acute:* Recognize that up to *10%* of ectopic pregnancies may have normally rising hCG levels. Do not rely on hCG trends alone to rule out ectopic pregnancy.
• *Definitive:* Medical management with methotrexate (if stable and unruptured) or surgical intervention (salpingostomy/salpingectomy) if ruptured or contraindicated for medical therapy.