Management of Pelvic Pain in Pregnant Patients

Initial Assessment

The American College of Radiology recommends a thorough clinical evaluation followed by ultrasound imaging of the abdomen and pelvis using both transabdominal and transvaginal approaches for a pregnant patient presenting with pelvic pain 1, 2
Obtain a serum beta-human chorionic gonadotropin (β-hCG) test to confirm pregnancy status and rule out ectopic pregnancy, miscarriage, or gestational trophoblastic disease 1
Perform a detailed clinical evaluation including history and physical examination to determine the most likely etiology (gynecological vs. non-gynecological) 2
Assess for red flag symptoms suggesting emergent conditions, such as vaginal bleeding (placental abruption) 3 and fever (infection, pelvic inflammatory disease) 3

Ultrasound (US) of abdomen and pelvis using both transabdominal and transvaginal approaches is the initial imaging modality of choice, providing better visualization of pelvic structures and avoiding radiation exposure to the fetus 4, 5, 6, 1
Doppler imaging should be considered a standard component of pelvic US 6
MRI abdomen and pelvis without IV contrast is preferred over CT for pregnant patients, with excellent soft tissue contrast and no ionizing radiation 7, 8
For suspected appendicitis, MRI has shown 100% sensitivity and 93.6% specificity in pregnant patients 4

Pelvic Inflammatory Disease/Tubo-ovarian Abscess can be diagnosed with US findings including thick-walled fluid collection, septations, and irregular margins, and managed with broad-spectrum antibiotics with anaerobic coverage 5, 3
Appendicitis can be diagnosed with US, which has sensitivity of 61.2% and specificity of 80% for diagnosis in pregnant patients, and managed with surgical consultation for appendectomy if confirmed 4, 6
Urinary Tract Conditions, such as urinary tract calculi and pyelonephritis, can be managed with antibiotics for infection, hydration and pain management for calculi 5, 8
Gastrointestinal Conditions, such as small bowel obstruction and inflammatory bowel disease, require management depending on specific diagnosis, which may involve surgical consultation 6, 5, 8

Radiation exposure should be minimized; ultrasound and MRI are preferred over CT 1, 2
Gadolinium contrast for MRI should be avoided unless absolutely necessary as it is a pregnancy category C drug 1
The diagnostic approach should consider both maternal and fetal well-being 2
Monitoring of fetal heart rate and uterine activity is recommended during evaluation 2
Overreliance on laboratory values without correlation to clinical presentation should be avoided 1
Failure to consider both gynecological and non-gynecological causes of pain should be avoided 2