FaridabadBy Dr B.C. Gupta, MD · 2026-11-01
Ask the Pathologist - MCQ of the Week. A short question to test how well you know common laboratory tests, with a plain-English explanation from Dr B.C. Gupta, MD (Pathology).
Q. Which blood test is most specific for damage to heart muscle?
- A. ESR
- B. Serum calcium
- C. Urine routine examination
- D. Troponin
Answer: Troponin
Troponin is the most specific blood test for heart muscle damage. It is a protein found inside heart muscle cells, where it helps the muscle contract, and it leaks into the bloodstream when those cells are injured. Because it is largely confined to the heart, damage to other muscles does not raise it in the same way, which is why it is the preferred cardiac marker.
CK-MB is another cardiac marker and is still requested sometimes. It also rises when the heart is injured, but it can also rise after injury to skeletal muscle, so it is less specific than troponin. CK-MB also rises and falls faster, which makes it less useful for detecting damage that happened several days earlier. The two are sometimes measured together, but troponin is the more reliable single test.
ESR, serum calcium and a urine routine examination do not detect heart muscle damage. ESR is a general marker of inflammation, serum calcium relates to bone and mineral health, and a urine routine examination checks the urine for infection, blood and other findings. If your doctor has asked for a troponin or another cardiac marker test, call the centre to confirm preparation and timing before you visit.
