Container must be labeled with patient's full name, date and time collection started, and date and time collection finished. Storage Instructions Maintain specimen at room temperature. Limitations Complete urine collections require vigilance on the part of nursing personnel. Ingestion of meat may increase creatinine values of urine collections as well as serum creatinine values. Drugs interfering with tubular creatinine secretion include cimetidine, trimethoprim, and probenecid.
Creatinine reabsorption occurs with very low urine flow rates.
Entities in which reabsorption occurs include severe congestive heart failure, uncontrolled diabetes mellitus, and acute renal failure. 1 Methodology Kinetic Additional Information Urine creatinine is not ordered alone. Creatinine clearance, which requires a serum creatinine, offers useful renal function data. Serum creatinine alone is not an adequate index of glomerular filtration rate. 1 Footnotes 1.