Urinalysis Reference Ranges (UA)

Complete urinalysis interpretation integrates physical appearance, dipstick chemistry, and microscopy. Result trends over time are often more clinically useful than a single isolated value.

Exam Components

• Physical examination: Color, clarity/turbidity, visible particles, and odor.
• Chemical examination (dipstick): pH, specific gravity, protein, ketones, glucose, bilirubin, nitrites, leukocyte esterase, blood, and related chemistry targets.
• Microscopic examination: Cells, crystals, microorganisms, and urinary casts in concentrated sediment.

Test	Normal Range	Critical Values
Color	Pale yellow to deep amber	Red or pink, very dark amber, orange, green or blue, cloudy, or foamy urine suggest pathology and need follow-up
Odor	Not foul smelling	Foul odor suggests infection or metabolic disorder
Volume	750-2,000 mL/24 hr	Oliguria: <500 mL/day; Anuria: <50 mL/day; Polyuria: >2.5 L/day
pH	4.5-8.0	Outside range may reflect UTI, stone risk, or systemic acid-base disorders
Specific gravity	1.003-1.032	High suggests dehydration; low suggests poor concentrating ability (for example diabetes insipidus)
Osmolarity	40-1,350 mOsmol/kg	Persistent extremes suggest impaired renal concentrating/diluting function
Urobilinogen	0.2-1.0 mg/100 mL	Elevated levels may indicate liver disease, biliary obstruction, or hemolysis
White blood cells	0-2 WBCs/HPF (method dependent)	Elevated WBCs/pyuria suggests urinary tract inflammation or infection
Leukocyte esterase	None	Positive result suggests urinary inflammation or infection
Protein	None or trace	Elevated levels suggest kidney damage or kidney disease
Bilirubin	<0.3 mg/100 mL	Elevated levels suggest liver disease or bile duct obstruction
Ketones	None	Positive ketones suggest metabolic stress, diabetes, or prolonged fasting
Nitrites	None	Positive nitrites support bacterial UTI, but false-positive/false-negative results can occur
Blood	None	Positive blood suggests stones, infection, trauma, or other urinary pathology
Glucose	None	Positive glucose suggests diabetes or other metabolic disorders

Clinical Significance

NCLEX Pattern

NCLEX questions often ask which urinalysis result needs immediate reporting, and which cue combinations indicate dehydration, infection, retention risk, or renal dysfunction.

Interpretation should account for life stage, hydration status, diet, and comorbidity context. “Normal” values and expected urine characteristics can vary across infants, adults, and older adults.

Elevated specific gravity

• Indicates: concentrated urine from reduced free-water balance, often fluid-volume-deficit-hypovolemia-and-dehydration
• Nursing action: review intake history, evaluate output trends, and correlate with hemodynamic and clinical signs

Positive leukocyte esterase or nitrites

• Indicates: probable urinary-tract-infections
• Nursing action: obtain ordered culture, monitor symptom progression, and escalate if fever, flank pain, or worsening status appears
• Interpretation note: correlate with microscopy and symptoms because leukocyte esterase/nitrite can yield false-positive or false-negative findings.

Pyuria threshold context

• Practical cue: pyuria is commonly referenced when urine white-cell burden reaches at least about 10 WBC/mm3.
• Nursing action: correlate with symptoms and urine culture planning instead of treating isolated microscopy as definitive infection alone.

Abnormal 24-hour volume pattern

• Indicates: oliguria, anuria, or polyuria patterns with different causes.
• Nursing action: verify measurement accuracy, assess fluid/medication context, and escalate sustained abnormal output

Composite and clearance testing context

• Timed or pooled urine collections: Used when single-sample urinalysis is insufficient for trend or total-excretion interpretation.
• Creatinine clearance: Uses timed urine volume and urine creatinine with serum creatinine to estimate filtration performance.
• Nursing action: protect specimen integrity, verify exact timing, and pair results with blood tests for interpretation.

Factors Affecting Results

• Dehydration: Concentrates urine and elevates specific gravity.
• Room-temperature delay: Promotes bacterial growth and can distort chemistry/microscopy.
• Light exposure: Can degrade light-sensitive analytes such as bilirubin/urobilinogen.
• Collection contamination: Can produce false-positive infection or blood findings and alter pH interpretation.
• Menstrual blood or procedural contamination: May cause false-positive hematuria signals.
• Exercise, pregnancy, and medication/food effects: Can shift color, odor, pH, protein/glucose, or ketone interpretation.
• 24-hour collection process errors: Missed voids, overflow/spillage, timing errors, or inadequate cooling reduce result reliability.

Related Labs

• basic-metabolic-panel - Electrolytes and kidney-related values add context to urinalysis abnormalities.
• arterial-blood-gas-abg - Acid-base findings can explain persistent urine pH abnormalities.
• serum-creatinine - Pairs with urinalysis to assess filtration and kidney injury progression.