A Calcium test measures the level of calcium in your blood, an essential mineral needed for strong bones and teeth, proper muscle function, nerve signaling, and blood clotting. Abnormal calcium levels can indicate issues such as parathyroid disorders, bone diseases, kidney problems, or vitamin D imbalance. Doctors usually recommend this test when symptoms like muscle cramps, tingling, fatigue, bone pain, or irregular heartbeat suggest abnormal calcium levels.

For the Calcium test, a small blood sample is collected from a vein, and fasting is usually not required, unless advised as part of a larger test panel. This test may be performed alone or along with other tests like phosphorus, vitamin D, magnesium, and PTH to evaluate bone and metabolic health more accurately.