Pelvic Inflammatory Disease vs Ectopic Pregnancy
Pelvic Inflammatory Disease and Ectopic Pregnancy are easy to mix up on the boards. Here's a side-by-side comparison — presentation, workup, imaging, and first-line treatment — drawn from our full outlines.
Pelvic Inflammatory Disease vs Ectopic Pregnancy at a glance
- Pelvic Inflammatory Disease: Polymicrobial ascending infection of the upper female genital tract — empiric treatment with low threshold to prevent sequelae.
- Ectopic Pregnancy: Implantation outside the uterine cavity — most commonly tubal; life-threatening hemorrhage if ruptured.
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Side-by-side comparison
| Feature | Pelvic Inflammatory Disease | Ectopic Pregnancy |
|---|---|---|
| At a glance | Polymicrobial ascending infection of the upper female genital tract — empiric treatment with low threshold to prevent sequelae. | Implantation outside the uterine cavity — most commonly tubal; life-threatening hemorrhage if ruptured. |
| Classic presentation | Sexually active young woman with bilateral lower abdominal pain, cervical motion tenderness, and mucopurulent cervical discharge.; Lower abdominal/pelvic pain (often bilateral); Abnormal vaginal discharge; Intermenstrual or postcoital bleeding; Dyspareunia; Fever, chills, nausea (variable); Many cases are mild or subclinical — silent… | Reproductive-age woman with amenorrhea, unilateral pelvic pain, vaginal bleeding, positive pregnancy test, and no intrauterine pregnancy on TVUS.; Amenorrhea (missed period); Unilateral pelvic or abdominal pain; Vaginal bleeding (often light); Shoulder tip pain (referred from diaphragmatic blood); Dizziness, syncope (hemorrhage); Some… |
| Workup / key labs | CDC minimum criteria (initiate empiric therapy if any one is present in a sexually active young woman with pelvic pain and no other cause): cervical motion tenderness, uterine tenderness, OR adnexal tenderness. Additional supportive criteria: oral temperature >38.3°C, abnormal cervical discharge, leukocytes on wet mount, elevated… | Pregnancy of unknown location: positive β-hCG without IUP or extrauterine findings on TVUS — requires serial β-hCG and possibly D&C to distinguish failed IUP from ectopic. Ectopic confirmed by visualization of extrauterine pregnancy or by absence of chorionic villi on D&C with persistent or rising β-hCG.; Quantitative serum β-hCG —… |
| Imaging | Transvaginal ultrasound — if TOA suspected (severe pain, palpable mass, systemic illness, or no response to therapy); CT scan — alternative diagnosis (appendicitis) or complicated disease; Laparoscopy — gold standard but rarely required; reserved for diagnostic uncertainty or failed therapy | Transvaginal ultrasound — primary imaging; look for intrauterine gestational sac (with yolk sac or embryo), adnexal mass, free fluid in pelvis; Doppler may show 'ring of fire' (vascular ectopic); Definitive: extrauterine gestational sac with yolk sac/embryo or extrauterine cardiac activity; Pseudogestational sac (collapsed fluid in… |
| First-line treatment | Outpatient regimen (CDC 2021): ceftriaxone 500 mg IM × 1 + doxycycline 100 mg PO BID × 14 days + metronidazole 500 mg PO BID × 14 days; Inpatient indications: pregnancy, severe illness, TOA, failure of outpatient therapy, inability to tolerate PO, surgical emergency cannot be excluded; Inpatient regimen: cefoxitin 2 g IV q6h or… | Hemodynamically unstable, ruptured, or large ectopic: emergent surgery (laparoscopic salpingectomy preferred over salpingostomy); Hemodynamically stable, candidate criteria met: methotrexate (intramuscular); Anti-D immunoglobulin (RhoGAM) for Rh-negative women; All require post-treatment β-hCG monitoring until <5 mIU/mL |
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