Creatinine, Random Urine

Creatinine, Random Urine

Preferred Specimen(s) 10 mL random urine – no preservative

Transport Container Plastic screw-cap container

Transport Temperature

• Ambient 7 days,
• Refrigerated 62 days

Methodology Spectrophotometry

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.

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