Symptom → lab tests
Which blood tests check for causes of dizziness?
Short answer
Lightheadedness — especially on standing — is checked for anemia (CBC, ferritin), low or high blood sugar (glucose, A1c), dehydration and electrolyte problems (metabolic panel), thyroid disease (TSH) and vitamin B12 deficiency. Spinning vertigo is usually an inner-ear problem that blood tests don't diagnose.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
When should you see a clinician instead of ordering a test?
- Dizziness with chest pain, fainting, a severe headache, double vision, trouble speaking or weakness — call emergency services
- Dizziness after a head injury, or with a very slow or very fast pulse — seek care
Why these tests for dizziness and lightheadedness?
Anemia and dehydration both lower the blood's ability to keep the brain perfused on standing; blood-sugar dips cause lightheadedness and shakiness; low sodium or potassium and thyroid disease disturb blood pressure regulation; B12 deficiency affects balance nerves. Blood pressure measurement — lying and standing — is the other half of this evaluation.
Which conditions do these tests help evaluate?
- Anemia — CBC, iron studies, ferritin, B12 and folate to find the cause of fatigue and low energy.
- Diabetes & Blood Sugar — A1c, fasting glucose and insulin to screen for prediabetes and diabetes.
Which tests, and what do they cost?
Prices are cash-pay; every order adds one $6 lab processing fee. Physician authorization is included; no insurance or referral needed.
| Test or panel | Type | Price | Fasting | Results |
|---|---|---|---|---|
| Baseline Anemia PanelSaves $56.96 vs ordering the tests separately | Panel · 5 tests | $74.99 | Yes | 2–4 business days |
| General Wellness PanelSaves $6.97 vs ordering the tests separately | Panel · 4 tests | $89.99 | Yes | 1–3 business days |
| CBC with Differential | Test · 14 biomarkers | $21.99 | No | 1–3 business days |
| Ferritin | Test | $24.99 | No | 1–3 business days |
| Glucose, Fasting | Test | $24.99 | Yes | 1–3 business days |
| Hemoglobin A1c | Test | $21.99 | No | 2–4 business days |
| Comprehensive Metabolic Panel | Test · 14 biomarkers | $22.99 | Yes | 1–3 business days |
| TSH (Thyroid Stimulating Hormone) | Test | $26.99 | No | 1–3 business days |
| Vitamin B12 | Test | $25.99 | No | 2–4 business days |
Common questions
Is dizziness or vertigo the lab-test kind?
Lightheadedness (feeling faint) has blood-test causes; true vertigo (the room spinning) is usually an inner-ear or neurological issue that a clinician evaluates directly.
Educational content, not a diagnosis. Lab results are one input; a clinician interprets them with your history and exam.