---
title: "What blood tests are used for heart palpitations?"
type: symptom
url: "https://www.test-well.com/symptoms/heart-palpitations"
symptom: Heart palpitations
aliases:
  - racing heart blood test
  - skipped heartbeats
  - fluttering heart
reviewed_at: 2026-09-06
review_status: reviewed
date_published: 2026-09-05
lab_fee_usd: 6
---

# What blood tests are used for heart palpitations?

> Palpitations that come and go are commonly linked to an overactive thyroid, anemia, and low potassium or magnesium — all checked with TSH and Free T4, a CBC, a metabolic panel and magnesium. Caffeine, stimulants, dehydration and anxiety are the frequent non-lab causes. Palpitations with fainting or chest pain need emergency care.


## When should you see a clinician instead of ordering a test?

- Palpitations with chest pain, fainting, severe shortness of breath or a very fast heart rate that won't slow — call emergency services
- A persistently irregular pulse — see a clinician for an ECG

## Why these tests for heart palpitations?

Excess thyroid hormone speeds the heart and causes irregular rhythms; anemia makes the heart work harder; potassium and magnesium govern the heart's electrical stability. Blood tests find these; the rhythm itself is captured by an ECG or wearable monitor, which a clinician can arrange.

## Which conditions do these tests help evaluate?

- [Thyroid Problems](https://www.test-well.com/conditions/thyroid-problems) — TSH, Free T4/T3 and antibodies to evaluate an under- or over-active thyroid.
- [Anemia](https://www.test-well.com/conditions/anemia) — CBC, iron studies, ferritin, B12 and folate to find the cause of fatigue and low energy.

## Which tests, and what do they cost?

| Test or panel | Type | Price | All-in (one item + $6 fee) | Fasting | Results |
| --- | --- | --- | --- | --- | --- |
| [Complete Thyroid Panel](https://www.test-well.com/tests/thyroid-complete-panel) | Panel (4 tests) | $109.99 | $115.99 | No | 3–7 business days |
| [General Wellness Panel](https://www.test-well.com/tests/general-wellness-panel) | Panel (4 tests) | $89.99 | $95.99 | Yes | 1–3 business days |
| [TSH (Thyroid Stimulating Hormone)](https://www.test-well.com/tests/tsh) | Test | $26.99 | $32.99 | No | 1–3 business days |
| [Free T4 (Thyroxine)](https://www.test-well.com/tests/free-t4-test) | Test | $23.99 | $29.99 | No | 1–3 business days |
| [CBC with Differential](https://www.test-well.com/tests/cbc-with-differential) | Test | $21.99 | $27.99 | No | 1–3 business days |
| [Comprehensive Metabolic Panel](https://www.test-well.com/tests/comprehensive-metabolic-panel) | Test | $22.99 | $28.99 | Yes | 1–3 business days |
| [Magnesium](https://www.test-well.com/tests/magnesium) | Test | $19.99 | $25.99 | No | 2–4 business days |
| [Ferritin](https://www.test-well.com/tests/ferritin) | Test | $24.99 | $30.99 | No | 1–3 business days |

Prices are cash-pay; every order adds one $6.00 lab processing fee. Physician authorization included.

## Common questions

### Can blood tests show an arrhythmia?

No — a rhythm problem is diagnosed by ECG or a wearable monitor. Blood tests find the metabolic and thyroid causes that provoke palpitations.

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---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-06. Review policy: https://www.test-well.com/editorial-policy

Canonical page: https://www.test-well.com/symptoms/heart-palpitations
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Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.