What is the difference between Troponin I and T test?

The main difference between the Troponin I and Troponin T tests lies in the specific isoforms of Troponin being measured. Troponin I (TnI) is a protein specific to cardiac muscle, while Troponin T (TnT) is found in both cardiac and skeletal muscle. In terms of clinical utility, both tests are used to diagnose and assess cardiac injury, particularly in conditions like heart attacks. Troponin I and T levels rise in response to heart muscle damage, providing valuable information to healthcare professionals. The choice of using Troponin I or T depends on the laboratory's preference or the specific assay used. It's important to note that both tests are highly sensitive and specific for cardiac injury, and their results should be interpreted in conjunction with the patient's symptoms, medical history, and other diagnostic findings.