Urinalysis is one of the oldest medical laboratory procedures used to evaluate health and diagnose diseases. It involves physical, chemical, and microscopic examination of urine. The physical exam assesses characteristics like color, clarity, volume, odor, pH, and specific gravity. The chemical exam uses dipsticks to detect substances like protein, glucose, ketones, blood, and bilirubin. Microscopic analysis identifies cells, casts, crystals, and microorganisms in the sediment. Together these tests provide valuable information about the function of the kidneys and urinary tract.