Symptoms of having elevated phosphorus levels include weakened bones, cardiovascular disease and calcium deposits in the muscles, according to Healthline. Calcium deposits in the muscles are rare and usually only occur in individuals with kidney problems and severe calcium absorption.
Testing the amount of phosphorus in the body is done to pinpoint gland complications, to assess the condition of a patient with kidney or bone disease, and to determine why an individual has abnormal levels of vitamin D, states WebMD. A person can also have a low level of phosphorus in the blood.
A patient should be sure to inform his physician of any medications or supplements he's taking before undergoing a phosphorus test, according to WebMD. Blood is taken from the arm for an adult patient and from the heel for an infant. With either type of test, there is a chance the patient may feel either nothing at all or a small pinprick as the needle pierces the skin.
Phosphorus aids with energy storage, bone growth, and the creation of nerve and muscle, notes Healthline. The presence of the mineral is abundant in dairy and meats. While a majority of phosphorus is found in the teeth and bones, physicians test the phosphorus levels in the blood to see if a patient has too much or too little of the mineral.