Creatinine Serum Adult male: 0.7-1.3 mg/dl Adult female: 0.6-1.1 mg/dl Adolescent: 0.5-1 mg/dl Child: 0.3-0.7 mg/dl Infant: 0.2-0.4 mg/dl Newborn: 0.3-1 mg/dl To evaluate renal function To estimate the effectiveness of glomerular filtration Acute or chronic renal failure Uremia or azotemia Renal Artery Stenosis Congestive Heart Failure Shock Dehydration Urinary tract obstruction Acromegaly or giantism Rhabdomyolysis Advanced liver disease Long-term corticosteroid therapy Hyperthyroidism Muscular Dystrophy Paralysis Dermatomyositis Polymyositis Hemolysis Warming of the specimen