Relative Index

Q: What is "Relative index" in cardiology biomarkers?  


Answer: Relative index is a ratio of CK-MB/total CK. The formula is 

Relative index = CK-MB/total CK x 100

Relative index helps in differentiating elevation of CK-MB between skeletal and cardiac origin. 

• Ratio < 3 is consistent with skeletal muscle source
• Ratio > 5 indicates cardiac source

#cardiology

#laboratory-science

Reference:

TP Singh, AK Nigam, AK Gupta, B Singh. Cardiac Biomarkers: When to Test? – Physician Perspective Journal, Indian Academy of Clinical Medicine z Vol. 12, No. 2, April-June, 2011