A 28-year-old woman presents to the emergency department with acute onset dysuria, frequency, and suprapubic pain for 2 days. Urine dipstick shows positive nitrites and leukocyte esterase. Urine microscopy reveals >10 WBC/hpf and gram-negative rods. Blood culture is pending. Vital signs are stable; no fever. What is the most appropriate immediate next step in management?

Explanation

## Clinical Context This is a straightforward uncomplicated acute cystitis (lower UTI) in a non-pregnant, afebrile woman with stable hemodynamics. Urine dipstick and microscopy findings are diagnostic. ## Management Approach for Uncomplicated UTI **Key Point:** Uncomplicated UTI in women does NOT require hospitalization, blood cultures, or broad-spectrum IV therapy. Empiric oral antibiotics are standard of care and should be initiated immediately to relieve symptoms and prevent progression. **High-Yield:** The distinction between uncomplicated and complicated UTI is critical: - **Uncomplicated:** Non-pregnant women, no structural/functional abnormality, no fever, stable vitals → oral outpatient therapy - **Complicated:** Pregnancy, fever/sepsis, structural abnormality, male, immunocompromised, or recurrent → IV therapy, imaging, longer duration ## Antibiotic Selection for Uncomplicated Cystitis | Agent | Dosing | Notes | |-------|--------|-------| | Cephalexin | 500 mg QID × 5–7 days | Oral, good for E. coli | | Levofloxacin | 500 mg daily × 3 days | Oral fluoroquinolone, shorter course | | Nitrofurantoin | 100 mg BID × 5–7 days | Avoid if eGFR <30 | | TMP-SMX | 160/800 mg BID × 3 days | If local resistance <20% | **Clinical Pearl:** Empiric therapy is justified because E. coli causes ~80% of uncomplicated UTIs and resistance patterns are predictable in most regions. Culture is confirmatory but should not delay treatment initiation. ## Why NOT the Other Options 1. **IV broad-spectrum therapy (ceftazidime + amikacin):** Reserved for septic, hospitalized, or complicated UTI patients. Overkill for stable, afebrile cystitis and increases cost, toxicity risk, and resistance pressure. 2. **Await culture results:** Delays symptom relief and risks progression. Empiric therapy is standard; culture guides de-escalation if needed. 3. **Renal ultrasound before antibiotics:** Imaging is indicated only if recurrent UTI, fever, flank pain, or obstruction is suspected. Not needed for first episode of simple cystitis. **Mnemonic: CUBIT** — **C**ystitis, **U**ncomplicated, **B**egin **I**mmediately, **T**opical (oral) therapy.