Urine For Microscopy

Function

Urine microscopy is the physical examination of urine sediment under a microscope after centrifugation. It is the 'gold standard' for looking at the cellular components of the urinary tract that cannot be fully characterized by chemical dipsticks alone. It identifies Red Blood Cells (RBCs), White Blood Cells (WBCs), epithelial cells, bacteria, yeast, crystals, and casts.

Why it is Ordered

This test is a cornerstone of renal and urological health screening. It is ordered for:

• Infection Detection: Identifying bacteria and high WBC counts (pyuria) indicating a Urinary Tract Infection (UTI).
• Kidney Disease Screening: Looking for 'casts' (cylindrical structures formed in the kidney tubules) which are hallmarks of renal pathology like glomerulonephritis.
• Stone Evaluation: Detecting crystals (calcium oxalate, uric acid) that may indicate a predisposition to kidney stones.
• Hematuria Investigation: Identifying the source of blood in the urine.

Associated Conditions

Microscopy can reveal much about systemic health. The presence of dysmorphic RBCs suggests glomerular bleeding, whereas normal-looking RBCs might suggest a bladder stone or tumor. Large amounts of squamous epithelial cells usually indicate sample contamination. Crystals can point toward metabolic issues or dehydration. Hyaline casts may be normal after heavy exercise, but cellular casts (WBC/RBC casts) almost always signify serious underlying kidney inflammation.