In a 67‑year‑old patient with lower abdominal and flank pressure, hematuria on urinalysis, and back pain, what additional diagnostic tests and management steps should be performed besides a non‑contrast CT abdomen/pelvis for suspected kidney stones?

CT Without Contrast is Appropriate—Now Focus on Infection, Renal Function, and Pain Control

You're on the right track with the non-contrast CT abdomen/pelvis, which is the reference standard for suspected kidney stones with 97% sensitivity 1. Beyond imaging, your immediate priorities should address infection risk, baseline renal function, and symptomatic management.

Essential Additional Steps

1. Urine Culture Before Any Intervention

• Obtain urine culture immediately if the urinalysis shows signs of infection (leukocyte esterase, nitrites, WBCs) or if you're considering any surgical intervention 2
• The 2+ blood you found is consistent with urolithiasis, but you need to rule out concurrent infection
• If culture is positive, treat with culture-directed antibiotics before any stone procedure—even in asymptomatic bacteriuria 2
• Do not proceed with definitive stone surgery if untreated bacteriuria/funguria is present 2

2. Blood Work for Risk Stratification

According to 2025 European guidelines 3, obtain:

• Creatinine and eGFR (assess baseline renal function, especially important at age 67)
• Ionized calcium (hypercalcemia suggests metabolic stone disease)
• Uric acid (elevated in uric acid stones)
• Electrolytes (sodium, potassium)
• CBC and CRP (if infection suspected)

3. Pain Management

• NSAIDs are first-line for renal colic (diclofenac, ibuprofen, or ketorolac)—superior to opioids for reducing need for additional analgesia 3
• Use lowest effective dose due to cardiovascular/GI risks in this age group

4. Medical Expulsive Therapy (If Appropriate)

• If CT shows a ≤10 mm distal ureteral stone, offer alpha-blocker therapy (tamsulosin, alfuzosin, silodosin) for approximately 30 days 2
• This increases spontaneous passage rates, reduces pain episodes, and decreases emergency visits
• For stones in middle/proximal ureter ≤10 mm, alpha-blockers may also be considered 2

Key Clinical Pitfalls

Don't Miss Infection

The combination of obstruction + infection = urologic emergency requiring urgent decompression. Watch for:

• Fever, elevated WBC, or elevated CRP
• If present with obstruction on CT, this requires emergent urologic consultation for drainage (stent or nephrostomy)

Age-Related Considerations

At 67 years old with hematuria:

• Higher risk for urothelial malignancy if no stone is found 4
• If CT is negative for stones, consider cystoscopy and upper tract imaging with contrast to evaluate for malignancy 5, 4
• Patients >40 years with gross hematuria warrant more aggressive workup 4

Renal Function Monitoring

• Silent obstruction can cause irreversible renal damage 6
• If CT shows severe hydronephrosis with cortical thinning, this suggests chronic obstruction and may indicate need for urgent intervention regardless of symptoms

What the CT Will Tell You

The non-contrast CT provides critical information for management decisions 1:

• Stone size, location, density (determines likelihood of spontaneous passage and treatment approach)
• Degree of hydronephrosis (mild vs. severe affects urgency)
• Secondary signs: periureteral stranding, perinephric inflammation
• Anatomic factors: stone-to-skin distance, body habitus (affects procedural planning)

Stones >10 mm, proximal location, or high density predict need for intervention 1

Immediate Action Algorithm

1. Send urine culture (if UA suggests infection or any intervention planned)
2. Order blood work (creatinine, calcium, uric acid, CBC if infection concern)
3. Start NSAID for pain control
4. Proceed with non-contrast CT
5. Based on CT results:
   • Stone ≤10 mm distal ureter + no infection → alpha-blocker + outpatient follow-up
   • Stone >10 mm or proximal + no infection → urology referral for intervention planning
   • Any obstruction + infection signs → emergent urology consultation
   • No stone found → consider cystoscopy and contrast imaging for hematuria workup

The 2023 ACR guidelines emphasize that low-dose CT protocols maintain 97% sensitivity while reducing radiation exposure 1—request this if available at your institution.