Diagnostic Approach to Vaginal Spotting with Right Lower Pelvic Pain

Immediate Diagnostic Priorities

Ectopic pregnancy must be excluded before any other diagnosis is pursued in all women of reproductive age with vaginal spotting and unilateral pelvic pain, according to the American College of Radiology 1, 2
The Centers for Disease Control and Prevention (CDC) recommends empiric treatment for pelvic inflammatory disease (PID) immediately if cervical motion tenderness, uterine tenderness, or adnexal tenderness is found on examination, with a minimum criteria requiring empiric treatment: uterine/adnexal tenderness OR cervical motion tenderness in sexually active women 3, 5, 2

The American College of Radiology recommends ultrasound as the initial imaging modality of choice for acute pelvic pain in reproductive-age women 1
If ultrasound is inconclusive and the patient is not pregnant, the American College of Radiology recommends CT abdomen and pelvis with IV contrast as the imaging modality of choice, with CT having 74-95% sensitivity and 80-90% specificity for adnexal torsion 1, 2, 6

Appendicitis has a 95% sensitivity and 94% specificity on CT, presenting with right lower quadrant pain, fever, and anorexia, according to the American College of Radiology 2

The CDC recommends beginning empiric broad-spectrum antibiotics immediately for PID, without delaying for culture results, to reduce the risk of long-term sequelae including tubal infertility and chronic pelvic pain 3, 4, 5, 2
The American Academy of Family Physicians recommends reassessing patients with PID within 72 hours, and hospitalizing for parenteral antibiotics if no clinical improvement is seen 4

In postmenopausal women, ovarian cysts account for one-third of gynecologic pain cases, followed by uterine fibroids, according to the American College of Radiology 8
The American College of Radiology recommends CT abdomen and pelvis as the first-line imaging in postmenopausal women due to a broader differential 8