What could cause a low urine creatinine?
Answer Hi Kim, Creatinine in urine may be measured for a number of purposes. In a 24 hour urine sample urine creatinine can be used as a rough marker of completeness of the sample. Samples with a low 24 hour urine creatinine may be due to incomplete collection or may be due to low muscle mass for the patient. This is a very broad answer to your question. However, if you need any information that is more specific, please do not hesitate to follow-up with me.