No fasting required.

Serum Calcium is tested to help diagnosis, and monitor a range of conditions relating to the bones, heart, nerves, and kidneys. The amount of calcium in the blood is controlled by the combined actions of parathyroid hormone (PTH) and 1, 25-dihydroxyvitamin D (Vitamin D).

 

Additionally, doctors can get a better understanding of the underlying problem by requesting additional tests such as phosphate, PTH, Vitamin D and magnesium.

 

The balance among these and the changes in their concentration, help the doctor to assess the cause of any abnormality in calcium.