A total calcium test is a blood test that measures the total amount of calcium present in the blood. Calcium is an important mineral that is essential for many bodily functions, including bone health, muscle function, and nerve transmission. The test may be ordered as part of a routine health check-up or to help diagnose and monitor certain medical conditions, such as kidney disease, thyroid disorders, or parathyroid gland disorders. Abnormal levels of calcium in the blood can indicate underlying medical conditions or imbalances in the body’s calcium regulation mechanisms. A total calcium test is a simple and relatively quick blood test that can be performed in a doctor’s office or lab. Depending on the results, doctors may recommend additional tests or treatments to address any potential underlying medical conditions.