Your body's calcium level is critical for bone, nerve, and muscle health. The Calcium Serum test measures the total amount of this vital mineral in your blood. It is a fundamental test used to screen for and monitor a wide range of conditions. Abnormal levels—either too high or too low—can indicate a problem with your parathyroid glands, bone disease, kidney disease, or nutritional deficiencies. This is a routine yet vital check, ensuring the core building blocks of your body are in perfect balance for optimal health.