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UA
See Urinalysis with Reflex Microscopic

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UIEP
See IEP/IFE Profile, Urine

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Unbound T4
See T4, Free, Serum

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UPE
See Protein Electrophoresis, Urine

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UPEP
See Protein Electrophoresis, Urine

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Urate, Blood
See Uric Acid, Serum

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Urate, Urine
See Uric Acid, Urine

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Urea Nitrogen, Body Fluid		Test Code: FLUN
CPT:	84520
Alternate Name:	Body Fluid BUN
Methodology:	Inverse Rate
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	2 mL body fluid
Container:	Red top tube, no serum separator
Reference Range:
None established, must be interpreted with clinical findings.

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Urea Nitrogen Clearance, 24-Hour Urine		Test Code: CALUN
Includes:	Volume Measurement Collection Period Creatinine, Urine Urea Nitrogen, Serum Urea Nitrogen, Urine Urea Nitrogen, Total Excretion Urea Nitogren, Clearance
CPT:	84545
Methodology:	Colorimetry and Two-point Rate
Testing Schedule:	Routine, daily
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	Entire 24-Hour urine collection AND 1 mL serum
Container:	24-Hour urine collection container, no preservative AND gold top (serum separator) tube
Collection:	• The serum urea nitrogen must be collected within 36 hours from the start of the collection period. • 24-Hour urine collection: See special instructions for “24-Hour Urine Collection”, listed under Specimen Collection, Preparation, and Handling Section
Special Instructions and/or Comments:
Transport to the laboratory promptly.
Reference Range:
• Creatinine, 24-Hour Urine: 0.8-2.8 g/24 hours • Urea Nitrogen, Serum (>1 year) : 10-26 mg/dL • Urea Nitrogen, Urine: 350-1000 mg/dL • Urea Nitrogen Excretion, Total: 12-20 g/24 hours • Urea Nitrogen Clearance: 41-65 mL/minute • Pediatric Urea Nitrogen, Serum: See individual test listing.
Critical Values:
Urea Nitrogen, Serum: • <17 years: >49 mg/dL • >17 years: >99 mg/dL
Clinical Utility:
Used in the evaluation of renal function.

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Urea Nitrogen, Serum		Test Code: BUN
CPT:	84520
Alternate Name:	Blood Urea Nitrogen; BUN
Methodology:	HNL Inverse Rate LPP Bichromatic Rate
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	1 mL serum
Container:	Gold top (serum separator) tube
Reference Range:
• <1 year: 6-17 mg/dL • >1 year: 10-26 mg/dL
Critical Values:
• <16 years: >49 mg/dL • >16 years: >99 mg/dL
Clinical Utility:
Used in the evaluation of renal function and renal disorders.

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Urea Nitrogen, Urine		Test Code: Random RUUN
CPT:	84540
Alternate Name:	Nitrogen Balance Study Urine Urea; Urine Urea Nitrogen; UUN
Methodology:	Inverse Rate
Testing Schedule:	Routine, daily
Report Available:	1 day
Specimen Requirements:
Collection:	5 mL random urine Container:Plastic urine container Collection:Random
Special Instructions and/or Comments:
• Transport to the laboratory promptly.
Reference Range:
350-1000 mg/dL
Clinical Utility:
Used to assess protein balance, renal function and renal disorders.

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Urea Nitrogen,24-Hour Urine		Test Code: 24UN
Includes:	• Volume Measurement • Collection Period • Creatinine, Urine • Urea Nitrogen, Urine
CPT:	81050, 84540
Alternate Name:	Nitrogen Balance Study Urine Urea; Urine Urea Nitrogen; UUN
Methodology:	Inverse Rate
Testing Schedule:	Routine, daily
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	Entire 24-Hour urine collection
Container:	Entire 24-Hour plastic urine container, no preservative
Collection:	24-Hour urine collection: See special instructions for “24-Hour Urine Collection”, listed under Specimen Collection, Preparation, and Handling Section
Special Instructions and/or Comments:
• Transport to the laboratory promptly.
Reference Range:
Creatinine, 24-Hour Urine: 0.8-2.8 g/24 hours Urea Nitrogen, 24-Hour Urine: 12-20 g/24 hours
Clinical Utility:
Used to assess protein balance, renal function and renal disorders.

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Urethral Brush Rinse/Tip Cytology
See Cytopathology, Fluid

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Urethral Brushing Smears
See Cytopathology, Direct Smears Cytology

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Urethral Culture
See Culture, Genital

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Urethral Trich Smear
See Trichomonas vaginalis Preparation

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Urethral Washings Cytology
See Cytopathology, Fluid

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Uric Acid, Body Fluid		Test Code: FURA
CPT:	84560
Alternate Name:	Body Fluid Uric Acid
Methodology:	Endpoint
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	1 mL body fluid
Container:	Red top tube, no serum separator
Reference Range:
Not established, must be interpreted with clinical findings.

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Uric Acid, Serum		Test Code: UA
CPT:	84550
Alternate Name:	Urate, Blood
Methodology:	HNL Endpoint LPP Bichromatic endpoint
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	1 mL serum
Container:	Gold top (serum separator) tube
Reference Range:
• Male: 3.5-8.5 mg/dL • Female: 2.5-6.2 mg/dL
Critical Values:
>13.0 mg/dL
Clinical Utility:
Used to evaluate purine metabolism, excessive cell destruction, kidney disease and gout.

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Uric Acid, Urine Random		Test Code: RUUA
CPT:	84560
Alternate Name:	Urate, Urine; Urine Uric Acid
Methodology:	Endpoint
Testing Schedule:	Routine, daily
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	5 mL random urine
Container:	Plastic urine container
Collection:	Random
Special Instructions and/or Comments:
Transport to the laboratory immediately.
Reference Range:
<60 mg/dL
Clinical Utility:
Used in the evaluation of renal function, gout and in the evaluation of kidney stones.

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Uric Acid, Urine 24-Hour		Test Code: 24UA
Includes:	• Volume Measurement • Collection Period • Creatinine, Urine • Uric Acid, Urine
CPT:	81050, 84560
Alternate Name:	Urate, Urine; Urine Uric Acid
Methodology:	Endpoint
Testing Schedule:	Routine, daily
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	Entire 24-Hour urine collection
Container:	Entire 24-Hour plastic urine container, no preservative
Collection:	24-Hour urine collection: See special instructions for “24-Hour Urine Collection”, listed under Specimen Collection, Preparation, and Handling Section
Special Instructions and/or Comments:
Transport to the laboratory immediately.
Reference Range:
• Creatinine, 24 Hour Urine: 0.8-2.8 g/24 hours • Uric Acid, 24-Hour Urine: 250-750 mg/24 hours
Clinical Utility:
Used in the evaluation of renal function, gout and in the evaluation of kidney stones.

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Urinalysis with Reflex Microscopic		Test Code: URIN
Includes:	• Specific gravity • pH • Leukocyte esterase • Protein • Glucose • Ketones • Blood • Nitrites • Reflexed when appropriate: Microscopic examination of urine sediment microscopic on any urinalysis demonstrating positive biochemical results for Protein, Nitrites, Blood or Leukocyte Esterase. NOTE: A microscopic exam may be requested at time of the order.
CPT:	81003 Reflexed when appropriate: 81001
Alternate Name:	Macroscopic Examination, Urine; Microscopic Examination, Urine; Routine Urinalysis; Routine Urine; UA.
Methodology:	Automated Analyzer with or without Manual Microscopic
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	4 mL random urine (7 mL optimal)
Container:	Plastic urine container
Collection:	• The first morning specimen is recommended. • If the specimen is likely to be contaminated by vaginal discharge or hemorrhage, a midstream clean catch specimen is desirable.
Special Instructions and/or Comments:
• Transport to the laboratory within 2 hours of collection. • If delay in transport, refrigerate specimen. NOTE: Refrigeration preserves formed elements in the urine, but may precipitate crystals not originally present.
Reference Range:
Specific gravity: 1.003-1.030 pH: 4.5-8.0 Leukocyte esterase: Negative Protein: Negative Glucose: Negative Ketones: Negative Blood: Negative Nitrite: Negative Microscopic: RBC’s 0-2/HPF WBC’s 0-5/HPF Bacteria Negative Yeast Negative Hyaline Casts 0-2/LPF Granular Casts 0-2/LPF WBC Casts 0/LPF RBC Casts 0/LPF Waxy Casts 0/LPF Fatty Casts 0/LPF Renal Epithelial Casts 0/LPF Squamous Epithelial Cells 0-5/LPF Transitional Epithelial Cells 0-1/LPF Renal Epithelial Cells 0-1/HPF
Clinical Utility:
Used to evaluate abnormalities in the urine, renal disease, UTI, urinary tract neoplasms and systemic diseases is a screening test and positive results should be followed by further qualitative studies.

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Urinary Eosinophils
See Eosinophil Smear, Urine

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Urinary Sugar Test
See Glucose, Urine

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Urine Alcohol
See Alcohol

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Urine Amylase/Creatinine Ratio
See Amylase/Creatinine Ratio, Random Urine

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Urine Chloride
See Chloride, Urine

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Urine Creatinine
See Creatinine, Urine

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Urine Culture
See Culture, Urine

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Urine Cytology
See Cytopathology, Fluid

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Urine Electrolytes
See Electrolytes, Urine

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Urine Electrophoresis
See Protein Electrophoresis, Urine

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Urine Ethanol
See Alcohol, Urine

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Urine for Eosinophils
See Eosinophil Smear, Urine

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Urine Immunoelectrophoresis
See IEP/IFE Profile, Urine

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Urine K+
See Potassium, Urine

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Urine Legionella Antigen
See Legionella Antigen, Urine

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Urine Mycoplasma hominis Culture
See Culture, Mycoplasma hominis

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Urine Osmolality
See Osmolality, Urine

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Urine pH
See pH, Body Fluid
See pH, Urine

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Urine Phos
See Phosphorus, Urine

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Urine Phosphorus
See Phosphorus, Urine

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Urine Pregnancy Test
See Beta Human Chorionic Gonadotropin, Urine

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Urine Protein
See Protein, Total, Urine

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Urine Protein Electrophoresis
See Protein Electrophoresis, Urine

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Urine Reducing Sugars
See Reducing Substances, Semiquantitative, Urine

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Urine Sodium
See Sodium, Urine

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Urine Toxicology Screen
See Drug Screen Comprehensive, Urine

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Urine Trich Wet Mount
See Trichomonas vaginalis Preparation

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Urine Urea
See Urea Nitrogen, Urine

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Urine Urea Nitrogen
See Urea Nitrogen, Urine

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Urine Uric Acid
See Uric Acid, Urine

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Urobilinogen, Random Urine		Test Code: UROB
CPT:	81003
Methodology:	Automated Analyzer
Testing Schedule:	Routine, STAT testing available
Report Available:	1 day
Specimen Requirements:
Minimum Volume:	1 mL urine
Container:	Plastic urine container
Special Instructions and/or Comments:
• Transport to the laboratory immediately. • A marked diurnal peak in excretion occurs, therefore an afternoon collection is recommended. • Refrigerate • Protect from light by wrapping the entire tube with aluminum foil. NOTE: Alkalinization of the urine by sodium bicarbonate administration increases excretion of urobilinogen.
Reference Range:
<1 mg/dL
Clinical Utility:
Used as a screen for hepatic and biliary disease and hemolytic anemia.

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Urogenital Culture
See Culture, Genital

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UUN
See Urea Nitrogen, Urine