What is this test?
This laboratory test is performed on a blood sample to measure the levels of enzymes and proteins related to cardiac injury. These enzymes and proteins leak into the bloodstream whenever the heart undergoes an injury. This test measures the levels of the following cardiac enzymes and proteins:
- Troponin I
- Troponin T
- Creatine Kinase
- CK-MB
- Myoglobin.
Why is this test performed?
This test is performed:
- To detect cardiac enzymes in the blood that are usually undetectable
- To help diagnose, evaluate and monitor patients with heart damage such as a heart attack
- To help diagnose, evaluate and monitor patients with acute coronary syndrome
- To rule out sign and symptoms similar to a heart attack.
- Which is the best biomarker of cardiac injury?
Troponin is considered the best biomarker because it is highly specific to the heart and remains in the blood for longer period as compared to other biomarkers.
- What is a heart attack?
Heart attack or myocardial infarction is a life-threatening condition characterized by compromised blood flow towards the heart resulting in irreversible tissue damage. It is usually due to blocking of heart arteries by deposition of fat or cholesterol.
- What are the symptoms of a heart attack?
Chest pain and difficulty in breathing are the typical symptoms of heart attack. Other common symptoms include:
- Chest tightness
- Pain in chest, arm, jaw, and throat
- Sweating
- Indigestion or abdominal pain
- Dizziness (lightheadedness)
- Fatigue
- Abnormal heartbeat
- Nausea
- Vomiting
- How many times will I get tested?
After your first test, you will probably be tested more than twice in the next 24 hours to notice any change in the levels of cardiac enzymes and proteins.
- How to prepare for this test?
No special preparations are required for this test. Inform your doctor about your complete medical and drug history. Wear a short-sleeved or loose shirt to aid the collection of sample.
- What are the risks of this test?
Collecting blood from a vein is a very easy procedure and pose only minimum risk, including:
- Bruising
- Bleeding
- Infection
- Lightheadedness
Normal ranges:
Creatinine kinase: 25-200 U/L
CK-MB: 0-4 ng/mL
Troponin: 0-0.4 ng/mL
Myoglobin: 17.4-105.7 ng/mL
Interpretation of test results:
Increased values of cardiac enzymes and proteins may indicate heart damage/heart attack, which should be treated accordingly.