Urinalysis, Complete With Microscopic Examination

Urinalysis, Complete With Microscopic Examination—also referred to as clinical urinalysis or complete urinalysis—is used to identify urine abnormalities and to aid in the diagnosis and management of renal diseases, urinary tract infection, urinary tract neoplasms, systemic diseases with renal involvement, and inflammatory or neoplastic processes adjacent to the urinary tract. The study is applied for comprehensive evaluation and differential diagnosis of kidney and urinary tract disorders; assessment of water–electrolyte and metabolic disturbances; evaluation of infectious and inflammatory conditions; and for treatment efficacy assessment, including perioperative or therapeutic monitoring.

Urine is the end product of renal filtration and tubular processing and reflects plasma composition and metabolism. It contains water, metabolic byproducts, electrolytes, trace elements, hormones, exfoliated epithelial cells, leukocytes, mucus, and salts. Microscopic examination of the urinary sediment provides qualitative and semi‑quantitative assessment of insoluble elements, including erythrocytes, leukocytes, epithelial cells of renal and non‑renal origin, casts, crystals, microorganisms, yeast, and mucus. Dry chemistry testing with reagent strips uses colorimetric indicator reactions within discrete pads that change color in proportion to analyte presence (for example, protein), enabling rapid appraisal of chemical parameters before microscopic examination when indicated.