As Measured by Creatinine
Creatinine is a chemical compound created by the energy-producing processes in your muscles. Creatinine is converted from creatine during these metabolic processes and is then filtered out of the blood by healthy kidneys, as a waste product in urine.
A measurement of creatinine in your blood or urine provides clues to help determine how well your kidneys are performing at their main role - filtering toxins and waste products from your blood.
Creatinine usually enters your bloodstream and is filtered from the bloodstream at a generally constant rate. The amount of creatinine in your blood should be relatively stable. An increased level of creatinine may be a sign of poor kidney function.
Kidney infection or impairment, overly-strenuous exercising, consuming too much protein and meat in the diet (not balancing), drug and alcohol use, certain medications.
Urinary tract infections, high blood pressure, sudden shock and more can result.