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Dizziness or light-headedness: blood tests that can help

"Dizziness" can mean feeling faint, the room spinning, or being unsteady while walking, and each points to different causes. Many common ones – low haemoglobin, low or high sugar, dehydration and salt imbalance – can be checked with blood tests. Others, like inner-ear problems or blood pressure drops on standing, need a doctor's examination.

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Tests to ask about

Complete blood count (CBC)

Checks haemoglobin – anaemia is a common cause of light-headedness.

₹330 Book Details
Electrolytes (sodium, potassium)

Low sodium or potassium can cause dizziness and weakness, especially in older adults.

₹2,085 Book Details
HbA1c / blood sugar

Both low and high sugar can make you dizzy.

₹420 Book Details
Vitamin B12

Low B12 can affect balance and cause unsteadiness.

₹1,090 Book Details
Thyroid profile (T3, T4, TSH)

Thyroid imbalance can affect heart rate and energy.

₹1,200 Book Details

Common reasons doctors look for

  • Low haemoglobin (anaemia)
  • Low blood sugar from skipped meals, or high sugar in diabetes
  • Dehydration or low sodium/potassium
  • Low vitamin B12 affecting nerves and balance
  • Blood pressure dropping on standing up
  • Inner-ear problems causing spinning (vertigo)

How to prepare

CBC, electrolytes, B12 and thyroid need no fasting. If fasting blood sugar is included, fast 8–10 hours (water is fine) – but if you feel faint while fasting, eat and inform your doctor.

When to see a doctor

Go to a hospital immediately if dizziness comes with sudden weakness or numbness on one side, slurred speech, drooping face, severe headache, chest pain, fainting or a very fast or very slow heartbeat. These can be signs of stroke or a heart problem.

Dizziness – FAQs

Which blood test is done for dizziness?

CBC, blood sugar, electrolytes (sodium, potassium), vitamin B12 and thyroid are commonly checked. Your doctor may also check blood pressure lying and standing.

Can low haemoglobin cause dizziness?

Yes. With less haemoglobin, less oxygen reaches the brain, which can cause light-headedness, especially on standing.

Can low B12 cause dizziness?

Low B12 can affect nerves and balance and is commonly checked in vegetarians and older adults with unsteadiness.

Room-spinning dizziness – will blood tests show it?

Spinning (vertigo) is often from the inner ear and may not show in blood tests. A doctor examination is important.

This page is general information, not medical advice or a diagnosis. Please talk to a doctor about your symptoms.

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