A 32-year-old woman with a history of pelvic inflammatory disease 6 months ago presents with a 2-week history of mild lower abdominal pain, intermittent fever (37.8°C), and scanty mucopurulent cervical discharge. She is in a monogamous relationship. Pelvic examination reveals mild cervical motion tenderness but no adnexal masses or significant adnexal tenderness. Urine pregnancy test is negative. Nucleic acid amplification testing (NAAT) for *Chlamydia trachomatis* is positive; *Neisseria gonorrhoeae* NAAT is negative. Which of the following is the most appropriate management?

Explanation

## Clinical Diagnosis and Severity Assessment **Key Point:** This patient has **mild-to-moderate PID** with minimal systemic symptoms (fever <38°C), mild pelvic tenderness, and no evidence of severe infection or abscess formation. She meets minimum diagnostic criteria (cervical motion tenderness + lower abdominal pain) but lacks features of severe disease. ## Severity Stratification in PID | Feature | Mild-Moderate | Severe | |---|---|---| | Fever | <38.5°C | ≥38.5°C | | Systemic toxicity | Absent/minimal | Present (tachycardia, hypotension) | | Peritoneal signs | Absent | Present | | Adnexal findings | Mild tenderness | Mass, abscess | | Management | Outpatient oral | Inpatient parenteral | This patient fits the **mild-moderate** category and is a candidate for outpatient oral therapy. ## Recommended Antibiotic Regimen for Outpatient PID **High-Yield:** CDC 2021 guidelines recommend for uncomplicated outpatient PID: 1. **Ceftriaxone 250 mg IM (single dose)** + **Doxycycline 100 mg PO BID × 14 days** (preferred regimen) 2. **OR Doxycycline 100 mg PO BID × 14 days** (if gonorrhea excluded by NAAT and low-risk patient) Since this patient has **negative gonorrhea NAAT** and **positive chlamydia NAAT** with mild disease, doxycycline monotherapy is appropriate. The single-dose IM ceftriaxone is often omitted in confirmed chlamydial PID without gonorrhea when the patient is reliable for follow-up. ## Mechanism of Action **Mnemonic: DOXY-PID** = **D**oxycycline inhibits bacterial protein synthesis, **O**ver 14 days covers *Chlamydia trachomatis*, **X**-rays (imaging) not needed for mild cases, **Y**ield excellent intracellular penetration, **P**erfect for outpatient therapy, **I**ntracellular pathogens targeted, **D**uration proven effective **Clinical Pearl:** Doxycycline achieves high concentrations in the genital tract and is highly effective against *Chlamydia trachomatis*. It is the preferred agent for chlamydial PID in outpatients with mild disease. ## Follow-up Requirements - Clinical reassessment in 48–72 hours - If no improvement, admit for parenteral therapy - Partner notification and treatment (same regimen) - Repeat NAAT 3–4 weeks after completion (test of cure) - Counsel on contraception and STI prevention [cite:Park 26e Ch 12; CDC STI Treatment Guidelines 2021]