Creatinine

Message

This test is for Imaging Center use only. All other locations should order CRNGFR.

Test Code

CREAT

CPT Codes
82565

Preferred Specimen

Serum (gold top) tube

Minimum Volume

0.5 mL

Other Acceptable Specimens

Lithium Heparin Plasma (green top) tube

Instructions

This test is for Imaging Center use only. All other locations should order CRNGFR.

Transport Container

Serum (gold top) tube or Lithium Heparin Plasma (green top) tube

Transport Temperature

Room Temperature or Refrigeration

Specimen Stability

Room Temperature - 5 days; Refrigerated - 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Quantity Not Sufficient, EDTA (purple top tube) contamination, IV contamination

Methodology
Colorimetric

Setup Schedule

Daily upon receipt

Report Available

Upon completion of analysis

Limitations

Do not use specimens obtained through catheters used to infuse hyperalimentation fluid.

Reference Range

Birth - 1 Month:                        0.6 - 1.2 mg/dL
1 Month - Adult (Female):    0.52 - 1.04 mg/dL
1 Month - Adult (Male):        0.66 - 1.25 mg/dL

Clinical Significance

Serum creatinine and urinary creatinine excretion is a function of lean body mass in normal persons and shows little or no response to dietary changes. The serum creatinine concentration is higher in men than in women. Since urinary creatinine is excreted mainly by glomerular filtration, with only small amounts due to tubular secretion, serum creatinine and a 24-hour urine creatinine excretion can be used to estimate the glomerular filtration rate. Serum creatinine is increased in acute or chronic renal failure, urinary tract obstruction, reduced renal blood flow, shock, dehydration, and rhabdomyolysis. Causes of low serum creatinine concentration include debilitation and decreased muscle mass. Exercise may cause an increased creatinine clearance. The creatinine clearance rate is unreliable if the urine flow is low.

This test is for Imaging Center use only. All other locations should order CRNGFR.

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.