Calcium levels refer to the amount of calcium present in the blood, which is essential for various bodily functions. Calcium plays a crucial role in building and maintaining strong bones and teeth, as well as supporting muscle function, nerve transmission, and blood clotting. The body regulates calcium levels through dietary intake, hormonal control, and the activity of the parathyroid glands. Normal calcium levels typically range from 8.5 to 10.2 mg/dL. Abnormal levels can indicate health issues; low levels may lead to conditions like osteoporosis or muscle cramps, while high levels can cause kidney stones or interfere with heart function. Regular blood tests can help monitor calcium levels and overall health.