Urine Microscopy and Initial Laboratory Evaluation for Suspected Glomerulonephritis

Urine Microscopy Findings

• The American College of Radiology recommends that the presence of dysmorphic red blood cells on microscopic urine analysis indicates glomerular bleeding and helps differentiate glomerular from non‑glomerular hematuria. 4
• According to the American College of Radiology, red blood cell casts observed in the urine sediment are pathognomonic for active glomerulonephritis and should prompt urgent nephrology evaluation. 4
• The American College of Radiology notes that tea‑colored or cola‑colored urine is a visual clue suggestive of glomerular bleeding and warrants prompt further work‑up. 4

Serum Creatinine and Metabolic Panel

• The American College of Radiology advises that serum creatinine should be measured immediately in patients with hematuria to assess for acute kidney injury and guide urgency of referral. 4
• The American College of Radiology recommends obtaining a complete metabolic panel (including BUN, electrolytes, and albumin) alongside creatinine to evaluate overall renal function and identify associated metabolic disturbances. 4

Pediatric Considerations

• The American College of Radiology states that renal ultrasound is the first‑line imaging modality in children with suspected glomerulonephritis to assess kidney anatomy before considering biopsy. 4
• The American College of Radiology advises that children who have isolated microscopic hematuria without proteinuria or dysmorphic red cells do not require immediate imaging, allowing for a more conservative initial approach. 4
• The American College of Radiology identifies post‑infectious glomerulonephritis as the most common acute glomerulonephritis in children, typically occurring after a streptococcal infection. 4