Troponin I

The Troponin I test contains 1 test with 1 biomarker.

Description: The Troponin I test is a blood test that is used to detect Troponin I which is part of a Troponin protein complex that regulates striated muscle contraction.

Also Known As: TnI Test, cTnI Test, Troponin Test

Collection Method: Blood Draw

Specimen Type: Serum

Test Preparation: No preparation required

When is a Troponin I test ordered?

When a patient with a suspected heart attack initially enters the emergency room, a troponin test is typically requested. This is followed by a series of troponin tests carried out over several hours.

What does a Troponin I test check for?

Muscle contraction is caused by a family of proteins called troponins, which are present in heart and skeletal muscle fibers. To help identify heart damage, troponin tests evaluate the blood's concentration of cardiac-specific troponin.

Troponin C, T, and I are the three different types of troponin proteins. By attaching to calcium, troponin C sends troponin I to the site of contraction, allowing the two proteins that shorten the muscle fiber to interact. The troponin complex is fixed to the arrangement of muscle fibers by troponin T. The types of troponin I and troponin T are different, but there is little to no difference in troponin C between skeletal and cardiac muscle. Troponin T or troponin I, which are cardiac-specific, can be measured in the blood to assist determine who has had heart injury.

In the blood, troponin often exists in negligible to undetectable levels. Troponin is released into the blood when cardiac muscle cells are damaged. The concentration in the blood increases with the degree of injury. Troponin tests are mostly used to assist establish whether a person has had a heart attack. They might be useful in assessing someone for other types of cardiac damage as well.

Cardiovascular-specific troponin I levels can rise in the blood within 3 to 4 hours of a heart attack and may continue to rise for 10 to 14 days.

Lab tests often ordered with a Troponin I test:

  • Myoglobin
  • CK
  • CK-MB
  • Hs-CRP

Conditions where a Troponin I test is recommended:

  • Heart Attack
  • Heart Disease
  • Angina

How does my health care provider use a Troponin I test?

Troponin tests are typically requested to assist distinguish between a heart attack and other illnesses that present with similar symptoms.

When the heart is injured, the heart muscle proteins troponin I and troponin T are released into the circulation.

Troponin tests are occasionally used to assess patients for heart damage resulting from reasons other than a heart attack or to differentiate between signs and symptoms like chest pain that could be caused by other conditions. If the signs and symptoms of angina worsen, testing may also be performed to determine the condition.

Troponin tests may be requested in conjunction with cardiac biomarkers like CK-MB or myoglobin. However, because it is more accurate in detecting cardiac damage than other tests and stays raised for a longer length of time, troponin I is the recommended test for a suspected heart attack.

What do my Troponin I test results mean?

Even small increases in troponin levels can signal some degree of heart injury, as can a high troponin level. It is likely that a person has had a heart attack or other type of cardiac injury if they have considerably raised troponin levels and, in particular, a spike in the results after a series of tests performed over several hours. After a heart attack, troponin levels can rise in the blood within 3 to 4 hours and can continue to rise for 10 to 14 days.

An raised troponin level in angina sufferers may be a sign that their condition is deteriorating and that they are more likely to experience a heart attack.

Additionally, myocarditis, cardiac weakness, congestive heart failure, as well as illnesses unrelated to the heart, like severe infections and kidney disease, can cause an increase in troponin levels.

It is doubtful that a person's heart has been hurt if their troponin levels are normal over the course of several hours of measurements. The reason of the signs and symptoms may not be related to the heart.

Injections, accidents, and medications that can harm muscles do not influence cardiac troponin levels because troponin tests measure troponin that is specific to the heart muscle and are therefore unaffected by damage to skeletal muscles. Although troponin levels may increase after intense activity, they typically have no medical relevance when there are no heart disease symptoms present.

We advise having your results reviewed by a licensed medical healthcare professional for proper interpretation of your results.

The following is a list of what is included in the item above. Click the test(s) below to view what biomarkers are measured along with an explanation of what the biomarker is measuring.

Troponin I

*Process times are an estimate and are not guaranteed. The lab may need additional time due to weather, holidays, confirmation/repeat testing, or equipment maintenance.

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