Calcium — Serum

What this test checks

Calcium is needed for strong bones, healthy muscles, steady nerves, and a regular heartbeat. This test measures the total calcium level in your blood, which the body keeps in a tight range by adjusting how much it takes from your bones and food.

Why do people get this test?

An abnormal calcium level can point to thyroid or parathyroid issues, vitamin D deficiency, or kidney problems. It is also a routine check for people with bone pain, fractures, or anyone on long-term medicines that affect calcium balance.

When you should consider this test

• Frequent muscle cramps, twitching, or tingling around the lips
• Repeated bone fractures or pain
• Known kidney disease or thyroid problems
• Low Vitamin D level being treated
• Older adults monitoring bone health

How to prepare

No special preparation needed. Take any calcium supplements as usual unless your doctor says otherwise.