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Lab Tests Beginning With U

21 tests in the Lab Values reference begin with the letter U. Every name links to a page with its typical adult range in both unit systems, plain-language notes on high and low results, and preparation notes where they apply.

A B C D E F G H I L M N NUMBERS O P R S T U V W Z

TestAbbr.Typical range (conventional)Typical range (SI)
Unsaturated Iron-Binding CapacityUIBC111–343 µg/dL20–61 µmol/L
Uric Acid—Male 3.4–7.0; Female 2.4–6.0 mg/dLMale 202–416; Female 143–357 µmol/L
Urine Albumin-to-Creatinine RatioACR<30 mg/g<3.4 mg/mmol
Urine Bilirubin—Negative—
Urine Blood—Negative—
Urine Casts—0–2 hyaline casts per low-power field0–2 hyaline casts per low-power field
Urine Color and Appearance—Yellow, clear—
Urine Creatinine—20–320 mg/dL1.8–28.3 mmol/L
Urine Culture—No growth—
Urine Glucose—Negative—
Urine Ketones—Negative—
Urine Leukocyte EsteraseLENegative—
Urine Nitrites—Negative—
Urine Osmolality—50–1,200 mOsm/kg50–1,200 mmol/kg
Urine pH—4.5–8.0—
Urine Protein, Dipstick—Negative to trace—
Urine Protein-to-Creatinine RatioPCR<150 mg/g<17 mg/mmol
Urine Red Blood Cells—0–2 per high-power field0–2 per high-power field
Urine Sodium—40–220 mmol/24 h40–220 mmol/24 h
Urine Specific GravitySG1.005–1.030—
Urine White Blood Cells—0–5 per high-power field0–5 per high-power field
Please note: Reference ranges vary between laboratories, and between the methods and instruments they use — the range printed on your own report is the one your result should be compared with. A result outside the range is not by itself a diagnosis, and a result inside it does not rule out illness. These pages are an educational summary, not medical advice: always discuss your results with the clinician who ordered them, who can interpret them in the context of your health and history.