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Phosphorus, Serum

Phosphorus, Serum

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A phosphorus serum test can determine whether you have high or low phosphorus levels in the blood. Phosphorus is a mineral needed to build strong bones and teeth as well as nerve signaling and muscle contraction.

The serum phosphorus test is done to evaluate phosphate levels in case of bone and kidney disease, to determine the cause of the abnormal level of Vitamin D, and to monitor levels while taking phosphorus and calcium supplements.

Excess phosphorus can indicate impaired kidney function, while low phosphorus levels may be due to malnutrition and lack of Vitamin D.

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What does Phosphorus, Serum measure?

Ph, Serum measures the levels of inorganic phosphates in blood. It is critical in the production and storage of energy as it forms a part of the energy currency of cells (Adenosine tri, di, and monophosphates). It is also a structural component of DNA. It is essential in the functioning of nerves and muscles, and in the growth and maintenance of healthy bones. In blood, phosphates act as buffers to maintain the pH and electrolyte balance of the body.

The main source of phosphorus comes from diet. Once consumed, it is quickly absorbed by the digestive system. In the body, most of the phosphates are bound to calcium in the bones and teeth. Some of it is found in muscles and nerves, and a small amount is present in cells, where it forms a structural component of DNA. Very small amounts of phosphates are normally found in circulation, and these levels are measured with blood phosphorus levels.

Phosphate levels in the blood are maintained within its very narrow normal concentration range by excretion of excess phosphorus through kidneys. Phosphate levels are also dependent on the levels of calcium, Vitamin D and parathyroid hormone in blood.



FAQs related to Phosphorus, Serum

An overnight fasting period is prescribed before the test. Inform the doctor about any medications you may be taking. No other preparations are required unless specified by your doctor.
Others tests that may be prescribed in case of an abnormal result in the blood Phosphorus test include: · Blood Calcium Test · Urine Calcium Test · Vitamin D Test · Electrolyte Panel Test · Kidney Function Test · Liver Function Test · Parathyroid Hormone (PTH) Test · Blood Sugar Tests
Hypophosphatemia is a condition where the blood phosphorus levels are below the normal range. This may occur due to: · Severe malnutrition · Alcoholism · Major burns · Diabetic ketoacidosis · Fanconi syndrome · Hyperparathyroidism (over secretion of parathyroid hormones) · Hypercalcemia (high blood calcium levels) · Hypokalemia (low blood potassium levels) · Long term use of antacids or diuretics · Long term diarrhea · Deficiency of Vitamin D in children · Some inherited conditions like X-linked Familial Hypophosphatemia (XLH) · Certain medications like diuretics, corticosteroids, bronchodilators, etc.
Symptoms of Hypophosphatemia include: · Muscular weakness · Fatigue · Bone pain and brittle bones · Loss of appetite · Irritability · Numbness · Confusion · Slow growth in children · Tooth decay Symptoms may not appear in case of mild deficiency, but only in case of severe or chronic deficiency.
Hyperphosphatemia is the condition where blood phosphorus levels rise higher than the normal range. This may occur due to: · Liver diseases · Kidney failure · Hypoparathyroidism (reduced secretion of parathyroid hormones) · Diabetic ketoacidosis initial stage · Increased phosphorus consumption in diet or through supplements
Symptoms of Hyperphosphatemia include: · Muscle spasms or cramps · Numbness and tingling sensation near mouth · Joint pain · Weak and brittle bones · Rashes and itchy skin
Dietary sources form the principal source of phosphorus. Some very commonly available food items rich in phosphorus are: · Animal Meat · Poultry · Seafood · Dairy products · Nuts · Whole grain · Beans
There is no risk associated with the test. However, since this test involves a needle prick to withdraw the blood sample, in very rare cases, a patient may experience increased bleeding, hematoma formation (blood collection under the skin), bruising or infection at the site of needle prick.
Content created by
Written by:
Dr. Lipika Khurana
BDS, PGDHHM
Reviewed by:
Dr. Swati Gupta (Anand)
MBBS, MD Lab Medicine
Want to know moreRead our editorial policy
Last Updated9th Feb 2026

Phosphorus, Serum test price for other cities

Price inAhmedabadRs. 209
Price inAllahabadRs. 209
Price inBangaloreRs. 171
Price inBhopalRs. 209
Price inChandigarhRs. 209

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Phosphorus, Serum