Urinary Tract Infection - CCS Case Guide
Key Takeaway: Urinary tract infection is one of the most common bacterial infections encountered in clinical practice and on the CCS exam. The key distinction is between uncomplicated cystitis (treated empirically with short-course oral antibiotics) and complicated UTI or pyelonephritis (requiring urine culture, broader antibiotic coverage, and possible imaging).
Urinary tract infection is one of the most common bacterial infections encountered in clinical practice and on the CCS exam. The key distinction is between uncomplicated cystitis (treated empirically with short-course oral antibiotics) and complicated UTI or pyelonephritis (requiring urine culture, broader antibiotic coverage, and possible imaging). Special considerations apply in pregnant patients, catheterized patients, and men. CCS scoring emphasizes appropriate antibiotic selection, obtaining cultures before antibiotics in complicated cases, and recognizing when hospital admission is needed.
Recognizing the UTI Presentation
- Uncomplicated Cystitis: Dysuria, urinary frequency, urgency, suprapubic discomfort, and possibly hematuria in a non-pregnant woman of reproductive age without structural abnormalities
- Pyelonephritis: Flank pain, costovertebral angle tenderness, high fever (>38.5°C), rigors, nausea/vomiting in addition to lower urinary symptoms
- Complicated UTI: UTI in the setting of pregnancy, male sex, structural abnormality, catheterization, immunosuppression, diabetes, or recent instrumentation
- Physical Exam: Suprapubic tenderness in cystitis; CVA tenderness, fever, and ill appearance in pyelonephritis; possible pelvic exam to rule out vaginitis/STI if symptoms equivocal
- Vital Signs: Often normal in uncomplicated cystitis; fever, tachycardia, and possible hypotension in pyelonephritis or urosepsis
- Elderly/Atypical: Altered mental status, falls, or functional decline may be the only presenting sign in elderly patients; avoid treating asymptomatic bacteriuria
Immediate Actions (First 5 Minutes)
These orders should be placed immediately — timing is scored:
Critical First Orders
- ✓ Obtain clean-catch midstream urinalysis with microscopy
- ✓ Obtain urine culture before antibiotics in complicated UTI, pyelonephritis, pregnant patients, or recurrent infection
- ✓ Initiate empiric antibiotics based on classification (uncomplicated vs complicated)
- ✓ IV access and fluid resuscitation if pyelonephritis with systemic signs
- ✓ Assess for pregnancy in women of reproductive age (urine hCG)
- ✓ Evaluate for urinary obstruction if not responding to treatment
Complete Workup
After initial stabilization, complete the diagnostic workup:
- Urinalysis with microscopy (WBCs, leukocyte esterase, nitrites, bacteria)
- Urine culture and sensitivity (indicated for complicated UTI, pyelonephritis, pregnancy, recurrent infections)
- Urine pregnancy test in women of reproductive age
- BMP (creatinine for renal function, especially if pyelonephritis)
- CBC with differential if systemic signs or pyelonephritis
- Blood cultures (two sets) if febrile, septic, or pyelonephritis requiring admission
- Lactate if sepsis suspected
- Renal ultrasound if concern for obstruction, abscess, or failure to improve in 48-72 hours
- CT abdomen/pelvis with contrast if suspected renal or perinephric abscess
- STI testing (GC/chlamydia NAAT) if sexually active with atypical symptoms
Treatment
Uncomplicated Cystitis
- Nitrofurantoin 100 mg PO BID for 5 days (first-line)
- TMP-SMX DS 1 tablet PO BID for 3 days (if local resistance < 20%)
- Fosfomycin 3 g single oral dose (alternative)
- Avoid fluoroquinolones for uncomplicated cystitis (reserve for complicated infections)
Pyelonephritis
- Outpatient: Ciprofloxacin 500 mg PO BID for 7 days or TMP-SMX DS PO BID for 14 days
- Inpatient: Ceftriaxone 1 g IV daily or ciprofloxacin 400 mg IV every 12 hours
- Obtain urine culture BEFORE initiating antibiotics and adjust based on sensitivities
- Step down to oral antibiotics when afebrile for 24-48 hours and tolerating PO
Pregnancy Considerations
- Treat ALL bacteriuria in pregnancy (even asymptomatic) due to risk of pyelonephritis and preterm labor
- Safe antibiotics: nitrofurantoin (avoid near term), cephalexin, amoxicillin-clavulanate
- AVOID TMP-SMX in first trimester (folate antagonism) and fluoroquinolones (cartilage damage)
- Repeat urine culture after treatment to confirm clearance
Supportive Care
- Adequate oral hydration
- Antipyretics (acetaminophen) for fever and discomfort
- Phenazopyridine 200 mg PO TID for 2 days for symptomatic dysuria relief
- Remove or replace indwelling catheter if catheter-associated UTI
Common Pitfalls
Scoring Tip: These are the most commonly missed actions for UTI cases.
- Treating asymptomatic bacteriuria in non-pregnant patients (only treat in pregnancy or before urologic procedures)
- Using fluoroquinolones for uncomplicated cystitis (overtreatment; reserve for complicated UTI)
- Not obtaining urine culture before antibiotics in complicated UTI or pyelonephritis
- Missing pyelonephritis by not eliciting CVA tenderness on exam
- Prescribing nitrofurantoin for pyelonephritis (it does not achieve adequate renal tissue levels)
- Forgetting to check pregnancy status before prescribing TMP-SMX or fluoroquinolones
Disposition
- Discharge home with oral antibiotics for uncomplicated cystitis and mild pyelonephritis in reliable patients
- Admit for IV antibiotics if severe pyelonephritis (sepsis, intractable vomiting, pregnancy with pyelonephritis, or suspected obstruction)
- Arrange outpatient follow-up in 48-72 hours for culture results and symptom reassessment
- Urology referral for recurrent UTIs or structural abnormalities
Key Orders Checklist
- ☐ Urinalysis with microscopy
- ☐ Urine culture and sensitivity
- ☐ Urine pregnancy test
- ☐ Nitrofurantoin 100 mg PO BID x 5 days (or appropriate antibiotic)
- ☐ BMP
- ☐ CBC if systemic signs
- ☐ Blood cultures x 2 if febrile
- ☐ Renal ultrasound if obstruction suspected
- ☐ Phenazopyridine for dysuria
- ☐ IV normal saline if pyelonephritis
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