Simple blood tests for heart disease help doctors to know the state of your cardiovascular system. The levels of specific proteins, enzymes, and markers of inflammation, will show if the heart is in a perfect condition or not.
This article will explain all that you need to know about testing for heart disease. First, it is vital that you learn why you should go for a blood test for a heart disease and the indicators.
The Importance of Blood Tests in Detecting Heart Disease
1. Assessment of Cholesterol Levels
High levels of low-density lipoprotein (LDL), aka “bad” cholesterol, can increase the risk of heart disease. Healthcare providers use the test to check the level before recommending any medication.
2. Detects Inflammation
Through testing, high-sensitivity C-reactive protein (hs-CRP) can be detected. The high intensity of this protein indicates higher chances that a patient may get a heart attack in the future.
3. Monitors Heart Function
Some blood tests for the heart also help monitor how the heart is functioning. For instance, a high level of troponin is a sign that the heart muscle is at risk. If these enzymes are abnormal, an individual may get a heart attack or other serious conditions
4. Check Blood Sugar Levels
Blood tests check glucose concentration, and provide information about diabetes or prediabetes conditions.
Blood Tests for Heart Disease
1. Lipid Panel (Cholesterol Test)
One of the popular blood test for heart disease is the lipid panel. This test weighs the levels of different types of cholesterol in your blood.
This test measures:
- LDL (Low-Density Lipoprotein): The “bad” cholesterol that clogs arteries.
- HDL (High-Density Lipoprotein): The “good” cholesterol that helps remove LDL.
- Triglycerides: A type of fat linked to heart disease.
- Total Cholesterol: The amount of LDL and HDL levels.
2. High-sensitivity C-reactive protein (hs-CRP)
High-sensitivity C-reactive protein (hs-CRP) is a blood test marker. The liver-producing protein elevates whenever the body has an inflammation.
(hs-CRP:
- Measures inflammation in the blood vessels.
- High levels indicate a higher risk of heart disease and stroke.
3. Troponin Test
- Detects heart muscle damage.
- High levels may suggest a recent or current heart attack.
4. BNP (B-type Natriuretic Peptide)
When the heart struggles to pump blood effectively, the B-type natriuretic peptide (BNP) levels rise. A high BNP level can point to heart dysfunction. If you experience symptoms like shortness of breath or swelling in your legs, your doctor might recommend this test.
5. Blood Sugar (Glucose and HbA1c)
- High blood sugar levels damage blood vessels.
- An HbA1c test gives a three-month average of blood sugar levels.
6. Homocysteine Test
- High levels can increase the risk of heart disease.
- Can cause artery damage and blood clots.
7. Fibrinogen Test
- Measures clotting proteins in the blood.
- Elevated fibrinogen increases the risk of heart attack.
8. D-dimer Test
- Checks for blood clot formation.
- Often used to diagnose deep vein thrombosis or pulmonary embolism.
9. Lipoprotein(a) Test
- Lp(a) is a type of cholesterol that contributes to plaque buildup.
- High levels increase the risk of atherosclerosis.
10. Creatine Kinase-MB (CK-MB) Test
- Identifies muscle damage related to the heart.
- Used when a heart attack is suspected.
How To Interpret Blood Tests for Heart Disease
- Your target cholesterol numbers should be below 200 mg/dL for total cholesterol. Ideal ranges for LDL cholesterol should be less than 100 mg/dL, while HDL cholesterol should be above 60 mg/dL.
- A level below 1.0 mg/L is low risk, but levels between 1.0 and 3.0 mg/L suggest moderate risk. Above 3.0 mg/L indicates high risk.
- BNP levels should be below 100 pg/mL. The condition of your heart deteriorates as BNP levels increase.
- Troponin in the blood causes a patient to experience chest pain, this can also affect the heart.
- Homocysteine below 15 micromoles per liter is perfect.
- HbA1c Levels below 5.7% are normal. 5.7% to 6.4% indicates prediabetes, while 6.5% or higher confirms diabetes.
Testing for heart disease
Guidelines to follow:
- Lipid Panel: Fast for 9-12 hours.
- Blood Sugar Test: Fast for 8 hours (unless it’s an HbA1c test).
- Other Tests: Follow your doctor’s instructions.
- Drink water but avoid alcohol and caffeine before testing.
Factors That Can Affect Blood Test Results
Several factors can determine the outcome of the test results. Here are some:
1. Fasting
Many blood tests demand that patients don’t eat a few hours before a test. When you eat it, it changes lipid levels in the body, which leads to incorrect results.
2. Timing of the Test
Certain blood marker levels will change when you take the test during the day. For example, hormone levels fluctuate during the day, and the stress hormone cortisol rises in the morning hours.
3. Medications
Various medications can alter blood test results. In addition, these may elevate liver enzymes or affect cholesterol levels. Always inform your healthcare provider if you are on any medications or supplements.
4. Hydration Levels
The concentration of blood elements is abnormal when the body lacks water; this can cause false report. So, you must drink enough water before the test.
5. Exercise
Physical exercise causes short-term increases in creatine kinase and troponin marker levels. If you engage in strenuous physical activity, let your doctor know, because it may influence your test outcomes.
Elevated Troponin Causes
1. Myocardial Infarction (Heart Attack)
A heart attack is a common factor that raises troponin levels. When there is blockage, it prevents blood from circulating to the heart; this triggers troponin to enter the bloodstream.
2. Unstable Angina
Unstable angina produces sudden chest pain through heart-blood flow reduction, which results in troponin detection in the blood. Even if it is not threatening like a heart attack, the presence of troponin shows that the heart is under stress.
3. Heart Failure
When heart failure occurs, the heart struggles to pump blood effectively. Elevated troponin levels develop when individuals experience heart muscle damage or stress caused by the heart strain.
4. Pulmonary Embolism
This occurs when blood clots reach the lungs and block pulmonary blood flow. The stress on the right side of the heart can increase troponin levels.
5. Myocarditis
Inflammation of the heart muscle, (myocarditis) can cause elevated troponin levels. The condition develops due to infections, autoimmune diseases, and exposure to some drugs.
6. Sepsis
Severe infections may affect multiple organ systems that can cause sepsis. Damage to the heart and the stress level thereby causes the troponin levels to increase.
Chronic Kidney Disease
The kidneys act as troponin filters through blood circulation, so when kidney function reduces, the troponin levels increase.
What Happens After Testing?
If results show abnormal levels, your doctor may recommend any of the following:
- Lifestyle Changes: May place you on a diet, and certain exercise.
- Medication: Cholesterol-lowering drugs, blood thinners, or blood pressure medications.
- Further Testing: Imaging tests like ECGs, stress tests, or echocardiograms.
Read also: Tylenol vs. Ibuprofen: Which is Better for Heart Disease?
Conclusion
Blood tests for heart disease help doctors to know the condition of the heart and suggest the best treatment. If the result is abnormal, the patient may need to redo the test. However, before a patient goes for test, he or she must follow the doctor’s instruction.
If you have a heart disease but have yet to do a heart test, perhaps you should see a doctor. Remember, early detection can save you a lot of stress.