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Creatine kinase (CK) Male: 24, [57] 38, [15] 60 [54] 174, [23] 320 [54] U/L or ng/mL: 0.42 [58] 1.5 [58] μkat/L: Female: 24, [57] 38, [15] 96 [23] 140, [23] 200 [54] U/L or ng/mL: 0.17 [58] 1.17 [58] μkat/L: CK-MB: 0: 3, [15] 3.8, [5] 5 [54] ng/mL or μg/L [5] Myoglobin: Female: 1 [59] 66 [59] ng/mL or μg/L: Male: 17 [59] 106 [59] Cardiac ...
Creatine kinase in the blood may be high in health and disease. Exercise increases the outflow of creatine kinase to the blood stream for up to a week, and this is the most common cause of high CK in blood. [16] Furthermore, high CK in the blood may be related to high intracellular CK such as in persons of African descent. [17]
The CPK-MB test (creatine phosphokinase-MB), also known as CK-MB test, is a cardiac marker [3] used to assist diagnoses of an acute myocardial infarction, myocardial ischemia, or myocarditis. It measures the blood level of CK-MB (creatine kinase myocardial band), the bound combination of two variants (isoenzymes CKM and CKB ) of the enzyme ...
The most reliable test in the diagnosis of rhabdomyolysis is the level of creatine kinase (CK) in the blood. [5] This enzyme is released by damaged muscle, and levels above 1000 U/L (5 times the upper limit of normal (ULN)) indicate rhabdomyolysis. [5]
Test Sensitivity and specificity Approximate peak Description Troponin test: The most sensitive and specific test for myocardial damage. Because it has increased specificity compared with CK-MB, troponin is composed of 3 proteins- Troponin C, Cardic troponin I, and Cardiac troponin T. Troponin I especially has a high affinity for myocardial injury.
Creatine kinase S-type, mitochondrial is an enzyme that in humans is encoded by the CKMT2 gene. [ 5 ] [ 6 ] Mitochondrial creatine kinase (MtCK) is responsible for the transfer of high energy phosphate from mitochondria to the cytosolic carrier, creatine .
Macro-creatine kinase (macro-CK) is a macroenzyme, an enzyme of high molecular weight and prolonged half-life found in human serum. [1] It is one of the most common macroenzymes. [ 1 ] Macro-CK type 1 is a complex formed by one of the creatine kinase isoenzyme types, typically CK-BB, and antibodies ; typically IgG , sometimes IgA , rarely IgM .
Creatine is produced by the enzyme guanidinoacetate methyltransferase (GAMT). After production in the liver and kidneys, creatine is transported to organs and tissues with high energy demands, most commonly the brain and skeletal muscles. In addition to endogenous production, creatine can be obtained from dietary sources or supplementation.