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Test Code LAB1765 Creatinine Clearance, Urine 24 Hour

Important Note

This test requires a 24 hr Urine and Serum.

Additional Codes

CPT Code: 82575

Methodology

Includes blood and urine creatinine and glomerular filtration rate (eGFR).

Performing Laboratory

TidalHealth Peninsula Regional - Core Laboratory: Chemistry

Specimen Requirements

Plasma or serum and urine are required. Plasma or serum SHOULD be drawn during urine collection.  However, blood drawn 12 hours BEFORE or AFTER the urine collection is acceptable.

 

Urine

Submit an entire timed urine collection (2-, 12-, or 24-hour) in a plain jug. Refrigerate specimen during collection, and send specimen refrigerated. Forward promptly to laboratory.

Note: 1. Patient’s height (in cm) and weight (in kg) are required.

2. 50% Acetic acid, boric acid, or 6N HCl are acceptable preservatives.

3. Follow instructions in Urine Collection in Special Instructions.

4. Indicate 2-, 12-, or 24-hour collection on request form.

5. Label specimen appropriately (2-, 12-, or 24-hour collection and as urine).

 

Submit only 1 of the following specimens:

 

Plasma

Draw blood in a green-top (lithium heparin) tube. (Hemolyzed specimen is not acceptable.) Spin down and send 2 mL of lithium heparin plasma.

Note: 1. Patient’s height (in cm) and weight (in kg) are required.

2. Indicate plasma.

3. Label specimen appropriately (plasma).

 

Serum
Draw blood in a gold-top serum gel tube. (Hemolyzed specimen is not acceptable.) Spin down and send 2 mL of serum.

Note: 1. Patient’s height (in cm) and weight (in kg) are required.

2. Indicate serum.

3. Label specimen appropriately (serum).

Reference Values

CREATININE, BLOOD

Males
0-11 months: 0.30-1.00 mg/dL

12 months-11 years: 0.30-0.70 mg/dL

12-17 years: 0.50-1.00 mg/dL

≥18 years: 0.64 - 1.27 mg/dL

Females

0-11 months: 0.30-1.00 mg/dL

12 months-11 years: 0.30-0.70 mg/dL

12-17 years: 0.50-1.00 mg/dL

≥18 years: 0.44-1.03 mg/dL

 

Note: Serum acetoacetate will lower creatinine results. Acetone and α-ketobutyric acid will elevate results.

 

CREATININE, URINE

Males:     980.00 - 2,200.00 mg/24hr

Females:  720.00 - 1,510.00 mg/24hr

 

CREATININE CLEARANCE

66 - 143 mL/min

 

Estimated Glomerular Filtration Rate (eGFR) by NIH Equation

eGFR Reference Range: ≥60 mL/min/1.73 m2

Calculation is not applicaple for patients under 18 years of age and will not be reported on those patients.

Additional Information

Do not order as “nurse to collect” since blood draw is required during urine collection.

For inpatients, check to ensure patient’s height (in cm) and weight (in kg) have been entered prior to ordering.

Special Instructions