Blood Tests For Heart Palpitations Diagnosis
Discover the key blood tests used to diagnose heart palpitations, including what they detect, how they help identify underlying causes, and when they're recommended by doctors.
Written by Dr. Siri Nallapu
Reviewed by Dr. Dhankecha Mayank Dineshbhai MBBS
Last updated on 29th Jul, 2025
Introdcution
Heart palpitations can be a frightening experience—your heart may feel like it’s racing, fluttering, or skipping beats. While palpitations are often harmless, they can sometimes signal an underlying health issue. One of the best ways to determine the cause is through blood tests.
In this article, we’ll explain what heart palpitations are, why blood tests are important for diagnosis, and how you can manage them effectively.
What Are Heart Palpitations?
Heart palpitations are sensations where you become unusually aware of your heartbeat. You may feel:
A fast or pounding heartbeat
Skipped beats or irregular rhythms
A fluttering sensation in your chest
While stress, caffeine, or exercise can trigger palpitations, they may also be linked to medical conditions like anaemia, thyroid disorders, or heart disease.
Why Are Blood Tests Needed for Heart Palpitations?
Blood tests help doctors identify possible causes of palpitations by checking for:
1. Electrolyte imbalances (low potassium, magnesium, or calcium)
2. Thyroid hormone levels (hyperthyroidism can cause rapid heartbeat)
3. Anaemia (low red blood cells reduce oxygen supply, making the heart work harder)
4. Blood sugar levels (low or high glucose can affect heart rhythm)
5. Heart-related enzymes (to check for heart damage or strain)
These tests provide crucial clues to determine whether your palpitations are due to a temporary issue (like dehydration) or a serious condition (like arrhythmia or thyroid disease).
Common Blood Tests for Heart Palpitations
Here are some key blood tests your doctor may recommend:
1. Complete Blood Count (CBC)
Checks for anaemia or infections that may cause palpitations.
2. Thyroid Function Test (TFT)
Measures TSH, T3, T4 levels to detect hyperthyroidism, a common cause of rapid heartbeat.
Consult Top Cardiologists To Know More
3. Electrolyte Panel
Evaluates potassium, sodium, calcium, and magnesium levels—imbalances can disrupt heart rhythm.
4. Blood Glucose Test
Checks for low blood sugar (hypoglycemia) or diabetes, which can affect heart function.
5. Cardiac Biomarkers (Troponin, BNP)
Detects heart muscle damage or heart failure if palpitations are severe.
How to Prepare for Blood Tests?
To get accurate results:
Fast for 8-12 hours if testing for glucose or cholesterol.
Stay hydrated unless instructed otherwise.
Inform your doctor about medications, as some can affect results.
Managing Heart Palpitations: Lifestyle & Prevention Tips
If your blood tests rule out serious conditions, you can reduce palpitations with these steps:
1. Reduce Stress & Anxiety
Practice deep breathing, meditation, or yoga.
Avoid overstimulation from caffeine, nicotine, or energy drinks.
2. Stay Hydrated & Maintain Electrolytes
Drink enough water and eat bananas (potassium), nuts (magnesium), and dairy (calcium).
3. Monitor Heart-Healthy Habits
Exercise regularly but avoid overexertion.
Limit alcohol and processed foods that disrupt heart rhythm.
4. Follow Up with Your Doctor
If palpitations persist, an ECG, Holter monitor, or echocardiogram may be needed.
When to See a Doctor Immediately?
Seek emergency care if palpitations come with:
Chest pain or pressure
Severe dizziness or fainting
Shortness of breath
Irregular pulse lasting long
These could indicate a heart attack or arrhythmia needing urgent treatment.
Book a Heart Health Check-Up Today
If you experience frequent palpitations, don’t ignore them. Early diagnosis can prevent complications. Schedule a blood test or cardiology consultation on Apollo 24|7 for quick, reliable results and expert advice.
Conclusion
Heart palpitations can be unsettling, but blood tests help uncover their cause. Whether it’s an electrolyte imbalance, thyroid issue, or anaemia, proper testing leads to the right treatment.
By making simple lifestyle changes and staying proactive with check-ups, you can keep your heart healthy and reduce palpitations.
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Consult Top Cardiologists
Dr. Anand Ravi
General Physician
2 Years • MBBS
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Zulkarnain
General Physician
2 Years • MBBS, PGDM, FFM
Bengaluru
PRESTIGE SHANTHINIKETAN - SOCIETY CLINIC, Bengaluru
Dr. Tripti Deb
Cardiologist
40 Years • MBBS, MD, DM, FACC, FESC
Hyderabad
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Cardiologist
7 Years • MBBS,DNB(GM),DM(Cardiology)
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Dr Nazneen Khan
Cardiologist
7 Years • M.B.B.S, M.D (MEDICINE), DrNB CARDIOLOGY
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