What is this test?
This laboratory test is performed on a blood sample to measure the levels of calcium floating freely in the blood. Ionized calcium is the metabolically active form of calcium. Calcium is important for normal physiological processes such as heart function, nerve conduction, muscle contraction, and blood clotting. It builds strong bones and teeth.
Why is this test performed?
- This test is performed to help in the diagnosis of following diseases:
- Thyroid disease
- Parathyroid disease
- Kidney disease
- Bone disorders
- Malnutrition
- To measure the levels of free calcium
- To monitor the efficacy of treatment.
- How to prepare for this test?
This test requires fasting for 6-8 hours before the test. Inform your doctor about the use of all prescribed and non-prescribed medicine. Wear a short-sleeved shirt to aid the collection of sample.
- Which medicines might affect my test results?
- Hydralazine
- Calcium salts
- Thyroxine
- Thiazide diuretics
- What are the symptoms of low ionized calcium?
- Numbness around the mouth
- Numbness in the feet or hands
- Muscle spasms
- What are the risks of this test?
Collecting blood from a vein is a very easy procedure and pose only minimum risk, including:
- Bruising
- Bleeding
- Infection
- Lightheadedness
- Which foods are rich in calcium?
- Dairy products
- Eggs
- Leafy vegetables
- Whole grain
- Nuts
- Calcium-fortified juices.
Normal range:
Adults: 4.8-5.6 mg/dL
Children: 4.8-5.3 mg/dL
- Interpretation of test results:
Causes of low ionized calcium:
- Hypoparathyroidism
- Osteomalacia
- Rickets
- Vitamin D deficiency
- Renal failure
Causes of low ionized calcium:
- Hyperparathyroidism
- Hyperthyroidism
- Vitamin A and D excess
- Paget’s disease
- Sarcoidosis
- Tumors.
