---
title: "What blood tests check for causes of numbness and tingling?"
type: symptom
url: "https://www.test-well.com/symptoms/numbness-and-tingling"
symptom: Numbness and tingling
aliases:
  - pins and needles
  - tingling hands and feet blood test
  - neuropathy blood test
reviewed_at: 2026-09-06
review_status: reviewed
date_published: 2026-09-05
lab_fee_usd: 6
---

# What blood tests check for causes of numbness and tingling?

> Tingling in the hands or feet has two very common testable causes: vitamin B12 deficiency and diabetes-related nerve damage. Vitamin B12, hemoglobin A1c and glucose come first, with a metabolic panel for kidney function and electrolytes, thyroid testing, and folate. Sudden or one-sided numbness is an emergency, not a lab question.


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

- Sudden numbness on one side of the body, facial droop, trouble speaking or severe headache — call emergency services
- Numbness spreading upward, weakness, or loss of bladder or bowel control — seek care immediately

## Why these tests for numbness and tingling?

B12 deficiency damages nerves and can do so before anemia appears; it is treatable and easy to miss. High blood sugar damages small nerve fibers over years — A1c is the screen. Low calcium or magnesium, kidney disease and hypothyroidism also cause tingling and show up on the CMP, magnesium and TSH.

## Which conditions do these tests help evaluate?

- [Diabetes & Blood Sugar](https://www.test-well.com/conditions/diabetes-screening) — A1c, fasting glucose and insulin to screen for prediabetes and diabetes.
- [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 |
| --- | --- | --- | --- | --- | --- |
| [Vitamin & Mineral Deficiency Panel](https://www.test-well.com/tests/vitamin-mineral-panel) | Panel (9 tests) | $189.99 | $195.99 | No | 3–5 business days |
| [Diabetes Screening Panel](https://www.test-well.com/tests/diabetes-screening-panel) | Panel (3 tests) | $59.99 | $65.99 | Yes | 2–5 business days |
| [Vitamin B12](https://www.test-well.com/tests/vitamin-b12) | Test | $25.99 | $31.99 | No | 2–4 business days |
| [Hemoglobin A1c](https://www.test-well.com/tests/hemoglobin-a1c) | Test | $21.99 | $27.99 | No | 2–4 business days |
| [Glucose, Fasting](https://www.test-well.com/tests/glucose-fasting) | Test | $24.99 | $30.99 | Yes | 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 |
| [TSH (Thyroid Stimulating Hormone)](https://www.test-well.com/tests/tsh) | Test | $26.99 | $32.99 | No | 1–3 business days |
| [Folate (Vitamin B9)](https://www.test-well.com/tests/folate) | Test | $32.99 | $38.99 | No | 2–4 business days |
| [Magnesium](https://www.test-well.com/tests/magnesium) | Test | $19.99 | $25.99 | No | 2–4 business days |

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

## Common questions

### My B12 is borderline. Could it still cause tingling?

Yes. Neurological symptoms occur at low-normal B12 levels in some people; methylmalonic acid can clarify. Discuss borderline values with a clinician before supplementing.

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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/numbness-and-tingling
Machine-readable catalog: https://www.test-well.com/api/catalog.json · MCP server: https://www.test-well.com/mcp · Overview for agents: https://www.test-well.com/llms.txt

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.