Cardiac troponin reference value

Under normal circumstances, the level of cTnI in peripheral blood is very low: (0 ~ 0.3 μg/L). After the onset of AMI, due to the small molecular weight, human blood is released quickly and the concentration rises rapidly. Zaninotto et al. take 1μg/L cTnI as the critical value of positive diagnosis, and the diagnostic rate of suspected AMI patients can reach 94.3%, and the diagnostic specificity is 100%.

Under normal circumstances, the reference value of cTnI in peripheral blood: ① 0.02 ~ 0.1.3μ g/l ② >; 0.2 μ g/L is the critical value. ③& gt； 0.5 μ g/L can diagnose AMI.

CTn is superior to CK-MB in the diagnosis of acute chest pain (with or without skeletal muscle injury). Studies have shown that there is no significant difference between cTnI and cTnT in the diagnosis of AMI, and both of them can identify myocardial damage that CK-MB cannot detect. Compared with cTnT, cTnI has lower initial sensitivity and higher specificity. In terms of relative value increase, the frequency of cTnT increase in patients with unstable angina pectoris is higher than that of cTnI. CTnT is superior to cTnI in predicting the mortality 30 days after AMI.