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Phosphorous Testing

Phosphate (as Phosphorus) (Quest Diagnostics)

Quest Price: $50.49

Serum phosphorus (Phosphate) levels alone are of limited diagnostic value and should be correlated with serum calcium levels. An increased phosphorus with decreased calcium suggests either hypoparathyroidism or renal disease. A decreased phosphorus and an increased calcium suggests hyperparathyroidism†or sarcoidosis. When both calcium and phosphorus are decreased diagnostic considerations include malabsorption, vitamin†D deficiency and renal tubular acidosis. Increased phosphorus and normal or increased calcium suggests Milk-alkali syndrome or hypervitaminosis D.

Alternative Name(s): Phosphorus

A significant deviation from the normal range may require further evaluation by your physician.

Serum phosphorus.

****Phosphate (as Phosphorus) is included in the Kidney Function Profile.****

Patient Instructions:


Phosphorous, Serum (LabCorp)

LabCorp Price: $44.99

The Phosphorus Test is a blood test used to diagnose ailments in gastrointestinal system, as well as kidney disorders. A significant deviation from the normal range may require further evaluation by your physician.

Serum phosphorus.

****Phosphorus is included in the Kidney Function Profile.***

Patient Instructions: Patient should fast for 12 hours preceding collection of specimen.

What is a Phosphorous Test?

A Phosphorous test measures the amount of phosphate, a charged particle containing the mineral phosphorous, which is present in a patientís blood. Phosphorous is used in the body to repair bones and teeth, as well as helping the nervous system function and assisting in muscle contraction. Roughly 85% of phosphorous contained in phosphate is found in an individualís bones, with the remainder being stored in tissues throughout the body. An elevated level of phosphate in a patient could indicate an issue with the kidneys, as the kidneys control the amount of phosphate in a personís blood.

Who May Need a Phosphorous Test?

Phosphorous tests are usually performed on patients who have kidney or bone disease, and are sometimes prescribed by physicians alongside a calcium test because of the unique physiological relationship between the two minerals. This test is also prescribed as a way to diagnose issues with certain glands, such as the parathyroid gland, as well as to assess the cause for abnormal vitamin D levels in a patient.

What Should I Expect from My Phosphorous Test?

Patients who are taking a phosphorous test will want to make sure they speak with their doctor about any medications they are taking prior to the test. Some medicines can alter the results of the test, so itís vital your healthcare provider is aware of any prescribed and non-prescribed medications, as well as supplements (particularly vitamin D) you are taking. The test itself begins with a blood sample being drawn from a patient, which is then sent to a lab for analysis. Though there are common reference ranges that exist for this test, speak with your doctor about your results and how they concern you and your health specifically.

Questions regarding online blood testing or how to order a lab test?

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