The severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) virus and resulting COVID‐19 pandemic present important diagnostic evaluation challenges. These range from understanding the value of signs and symptoms in predicting possible infection, assessing whether existing biochemical and imaging tests can identify infection and people needing critical care, and evaluating whether new diagnos...

What is cTnI? Troponin (Tn) is a complex of three regulatory proteins (C, I, T) that is integral to muscle contraction in skeletal muscle and cardiac muscle, but not smooth muscle. However, TnT and TnI in cardiac muscle are presented by forms different from those in skeletal muscles. Distribution of cTnI during AMI When AMI and myocardial cell damage occurs: The free cTnI in cardiac muscle is rele...