 An expected creatinine concentration indicates the test sample is undiluted, whereas low amounts of creatinine in the urine indicate either a manipulated test or low initial baseline creatinine concentrations.Test samples considered manipulated due to low creatinine are not tested, and the test is sometimes considered failed.In the United States and in most European countries creatinine is usually reported in mg/dL, whereas in Canada, Australia, and a few European countries, μmol/L is the usual unit.