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calcium blood test
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What Is A Calcium Blood Test?

A calcium blood test assesses the level of calcium in your bloodstream. Calcium is one of the pivotal minerals in your body. Your body needs calcium to make robust bones and teeth. Calcium plays a crucial role in the proper functioning of your nerves, muscles, and heart. Nearly, 99% of your body’s calcium is accumulated in your bones. The remaining 1% migrates through your bloodstream. Calcium (Ca) blood test evaluates whether your body has abnormal (too high or too little) levels of calcium in the blood. A calcium test is also useful in diagnosing various health issues like bone disease, thyroid disease, kidney disease, heart disease, nerve diseases and so on.

calcium blood test

The cost of the calcium blood test is Rs.150 to Rs.700, depending on your location and place.

Please check the price of the calcium test in Delhi/NCR, your nearby centers and other details.

Test Summary

Also known as Total calcium, ionized calcium
Test Type Blood
Calcium test includes To check the levels of calcium in your blood
Preparation You don’t need any special preparation for this test. Inform your doctor if you are taking any medications
Reporting Within 24 hrs
Test price The cost of the calcium blood test is Rs.150 to Rs.700, depending on your location and place.
Also included in Health Insurance Plans
Related tests Vitamin D test, CBC, kidney function test


Your body has plenty of calcium and it uses this mineral in various ways including

  • Strengthening your bones and teeth
  • Contracting your muscles
  • Narrowing and widening blood vessels
  • Send and receive nerve messages
  • Production of hormones
  • Clot your blood


Calcium presents in your bones in two forms

  • Free calcium is not fastened to anything except in your blood
  • Bound calcium is attached to albumin (a protein) or other substances in your blood


Two types of blood calcium tests are conducted

Total Calcium Test

This type of test evaluates both free and bound calcium. The doctors mostly recommend this type of test.

Ionized Calcium Test

This type of test only measures free calcium

Why do you need the calcium test?

A calcium test is a part of your regular health exam. Your doctor may recommend this test as a part of the comprehensive metabolic panel.

Your doctor may suggest this test if you are suffering from a disease that might affect this mineral.

  • Bone diseases like osteoporosis
  • Various types of cancer like breast, kidney, lung, head, and neck
  • Kidney or liver disease 
  • Nerve problem
  • Overactive thyroid gland
  • Pancreatitis (An inflammation of the pancreas)
  • Parathyroid disease (glands in your neck are too active or not active)
  • Your intestine is unable to absorb nutrients from foods
  • Your EKG test shows some abnormalities


This test is also performed to check how your body is responding to the treatments of the above-mentioned conditions. This test is also useful in monitoring the side effects of medicines you are taking. You may conduct this test if you have symptoms of high calcium like

  • Loss of appetite
  • Constipation
  • Always tired
  • Intense thirst
  • Nausea
  • Vomiting
  • Stomach aches
  • Weakness


If you have symptoms of low calcium, like these:

  • Uneven heartbeat
  • Muscle cramps
  • Seizures
  • Tingling in your feet and hands


The Preparation for the Test

Though this test doesn’t demand any special preparation, inform your doctor if you are taking various supplements or prescribed medications. Some medicines that may hamper your test results are,

  • Antacids
  • High blood pressure medicines
  • Diuretics
  • Lithium or Bipolar Disorder Medications
  • Vitamin D supplements


Test Procedure

  • You need to visit a diagnostic center or a hospital where an experienced technician or nurse will put up an elastic band on your upper arm.
  • The technician will collect the blood sample from your upper hand smoothly as he can clearly identify the vein
  • He will insert the needle into your vein on the arm
  • The sample will be deposited in a tube
  • The needle and the elastic band will be removed
  • The puncture site will be covered up by a bandage or gauze


The interpretation of the test results

The calcium levels normal values in adults are:

  • Total blood calcium: 8.5 to 10.5 milligrams per deciliter (mg/dL)
  • Ionized calcium: 4.65 to 5.2 mg/dl


You may have high total calcium levels due to

  • Overactive parathyroid or thyroid gland
  • Cancer
  • Sarcoidosis (an inflammatory disease where granulomas form around your body)
  • Tuberculosis 
  • Staying in bed for too long
  • Sufficient vitamin D in your diet
  • High blood pressure drugs called thiazide diuretics
  • Kidney transplant


You may get total low calcium levels due to

  • Low proteins in your blood
  • Underactive parathyroid gland
  • Inadequate calcium, magnesium, and vitamin D 
  • Too much phosphorus
  • Pancreatitis
  • Kidney failure


What are other tests that you may need to do along with the calcium test?

If your normal blood calcium levels are too low or high, your doctor may advise you in performing these tests

      Kidney function tests
      Parathyroid hormone level
      Phosphorus level
      Vitamin D level

What are the risks of the CRP test?

Since this is a blood test, hence risks are minimal. You may get some symptoms like

      Persistent bleeding at the puncture site
      Dizziness or lightheadedness
      Pain at the puncture site
      Site infection
      A lump under your skin

What foods to avoid when calcium is high?

Discard those food items that are high in calcium. Restrict your intake of food items like milk, cheese, cottage cheese, yogurt, pudding, and ice cream. Never purchase dairy products that come up with added calcium.

Can vitamin D cause high calcium levels?

If you are taking vitamin D supplements for a prolonged period, then this may enhance your blood calcium level. If calcium in the blood goes beyond the normal level, you may develop hypercalcemia.

What cancers cause high calcium levels?

Cancers that are responsible for increasing calcium in your bloodstream are,

      Lung cancer
      Head and neck cancers
      Multiple myeloma
      Kidney cancer
      Breast cancer
      Gastrointestinal (digestive system) cancer

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