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PHLB - LABS
Common Urinalysis Tests
PHYSICAL, CHEMICAL & MICROSCOPIC EVALUATIONS | |
PHYSICAL EVALUATION | Color, Clarity, Specific Gravity |
Color | Abnormal: Clinically significant results from blood melanin, bilirubin, urobilin in samples |
Clarity | Turbidity may be result of chyle, fat, bacteria, RBCs, WBCs or precipitated crystals |
Specific Gravity | Variations of dissolved solids in urine is normal; inconsistencies suggest renal tubular involvement or ADH deficiency |
CHEMICAL EVALUATION | Blood, bilirubin, glucose, ketones, leukocyte esterase, pH, protein, nitrite, urobilinogen |
Blood | Hematuria: result of hemorrhage, infection or trauma |
Bilirubin | Aids in differentiating obstructive jaundice from hemolytic jaundice (which will not increase bilirubin in urine) |
Glucose | Glucosuria: may be result of DM Diabetes Mellitus, renal impairment or ingestion of large amount of carbohydrates |
Ketones | Elevated ketones occur in uncontrolled diabetes mellitus and starvation |
Leukocyte Esterase | Certain white cells (neutrophils) in abundance indicate UTI |
pH | Variations in pH indicate changes in acid-based balance (normal); loss of ability to vary pH indicates tissue breakdown |
Protein | Proteinuria: indicator of renal disorder. Ex. injury or renal tube dysfunction |
Nitrite | Positive result suggests bacterial infection. Significant only on 1st morning specimen or urine incubated in bladder for at least 4 hours. |
Urobilinogen | Occurs in increased amounts when patient has hepatic problems or hemolytic disorders |
MICROSCOPIC EVALUATION | Analysis of urinary sediment reveals status of the urinary tract, hematuria, pyuria. Presence of casts and tissue cells is a pathologic indicator |