| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Creatinine, Random Urine
Test Code8459
CPT Codes
82570
Preferred Specimen
10 mL random urine, no preservative, collected in sterile screw cap container
Minimum Volume
0.5 mL
Other Acceptable Specimens
Urine collected in urinalysis transport tube (yellow-top, blue fill line, preservative tube) • Preserved urine with 6N HCl acid submitted in a plastic, urine container
Instructions
Please submit 10 mL of a well-mixed random collection. Collect urine without preservative. Refrigerate after collection.
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 7 days
Refrigerated: 7 days
Frozen: 28 days
Refrigerated: 7 days
Frozen: 28 days
Methodology
Colorimetric (C) • Kinetic
Setup Schedule
A.M. Sets up 6 days a week.
Report Available
Reports in 1 day.
Clinical Significance
Creatinine is the endproduct of creatine metabolism. Creatine is present primarily in muscle and the amount of creatinine produced is related to total skeletal muscle mass. Daily creatinine production is fairly constant except when there is massive injury to muscle. The kidneys excrete creatinine very efficiently and blood levels and daily urinary excretion of creatinine fluctuates very little in healthy normal people. Since blood and daily urine excretion of creatinine shows minimal fluctuation, creatinine excretion is useful in determining whether 24-hour urine specimens for other analytes (e.g., protein) have been completely and accurately collected.
