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Phosphorus, Serum

Also known as Phosphorus blood test, Phosphate test
You need to provide
This test is for
Male, Female
Test Preparation
  1. Overnight fasting is preferred.

Understanding Phosphorus, Serum

What is Phosphorus, Serum?

A Phosphorus, Serum test measures the amount of phosphorus, an important mineral in your body. The 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 the effectiveness of phosphorus and calcium supplementation.

Phosphorus is one of the essential and the second most abundant minerals found in the human body, after calcium. Its primary function is to provide structural strength and integrity to bones and teeth. Phosphorus regulates the normal function of nerves and muscles, including the heart, and is also a building block of our genetic material, DNA. It also plays an important role as a buffer, by maintaining the body’s acid-base balance.

Phosphorus deficiency (hypophosphatemia) may be seen with malnutrition, malabsorption, acid-base imbalances, increased blood calcium, and diseases that affect kidney function such as uncontrolled diabetes. Excessive phosphorus (hyperphosphatemia) may be seen with increased intake of the mineral, low blood calcium, etc. A Phosphorus, Serum test aids in diagnosing abnormally high or low levels of phosphorus.

Your doctor may advise a Phosphorus, Serum if you show symptoms of abnormal phosphorus levels. It should be noted that someone with mild to moderate phosphorus deficiency often shows no symptoms. However, symptoms of severe phosphorus deficiency may include muscle weakness, anxiety, irritability, numbness, confusion, slow growth in children, bone pains, bone fragility, etc. An excess or overload of phosphorus may cause symptoms such as muscle cramps, bone and joint pain, weak and brittle bones, and even seizures.

Usually, overnight fasting is preferred before undergoing a Phosphorus, Serum test. However, inform your doctor about any medications or supplements you are taking, as some of them may affect your test results. Doctors may ask you to temporarily discontinue some medicines before the test. 

Reference ranges are approximate and may vary based on factors such as age, gender, medical history, etc. Narrate your complete medical history to help the doctor correlate your clinical and laboratory findings. The doctor may suggest some lifestyle modifications including dietary changes to manage your condition. 

What is Phosphorus, Serum used for?

A Phosphorus, Serum test is done: 

  • To evaluate phosphate levels in case of bone and kidney diseases.

  • To determine conditions associated with certain glands like parathyroid glands.

  • To determine the cause of abnormal levels of vitamin D.

  • In case of uncontrolled diabetes.

  • To monitor treatment effectiveness when taking phosphorus or calcium supplements.



What does Phosphorus, Serum measure?

A Phosphorus, Serum test is used to evaluate the level of phosphorus in your blood. Phosphorus is an inherent component of all living cells in the system and most, 85 percent, is located in the tissues of bones and teeth, while the remaining 15 percent is part of the blood and other soft tissues. Your body obtains its daily phosphorus requirements through dietary sources and under normal conditions, once the necessary amounts of phosphorus are absorbed by the cells and tissues, the remaining is eliminated via the urine.

Besides consuming a wholesome diet enriched with sufficient amounts of phosphorus, it is also important to ensure ample intake of calcium and vitamin D, to maintain overall health.


Interpreting Phosphorus, Serum results


Normal range: 2.40 to 4.40 mg/dL

Phosphate concentration in the blood is maintained within a narrow normal range between 2.40 mg/dL and 4.40 mg/dL.

Hypophosphatemia or low blood phosphorus is indicated if phosphorus concentration lies below the normal range.

Hyperphosphatemia or high blood phosphorus is indicated if phosphorus concentration lies above the normal range.

Phosphate levels in children are usually higher than in adults due to the active growth of bones in children.

Answers to Patient Concerns & Frequently Asked Questions (FAQs) about Phosphorus, Serum

Frequently Asked Questions about Phosphorus, Serum

Q. Why do I need a Phosphorus, Serum test?

You may need a Phosphorus, Serum test if you have symptoms of kidney disease, including bone problems, fatigue, weakness, irritability, numbness, bone pain and brittle bones, joint pain, confusion, etc· You may also need this test if your doctor suspects kidney disease or you have uncontrolled diabetes.

Q. What factors can affect the Phosphorus, Serum test results?

Several factors can affect your Phosphorus, Serum test results including diet, medications, and supplements. Your kidney function and your gut health can also affect your phosphorus test results.

Q. What is the need for phosphorus in my body?

Phosphorus is necessary for the body for the production of energy, the functioning of muscles and nerves, and the growth of bones.

Q. What are the common dietary sources of phosphorus?

The common food sources containing phosphorus include peas, nuts, beans, cereals, dairy products, eggs, chicken, beef, and fish.

Q. Should I inform my doctor about my ongoing medication and supplements?

Yes, please inform your doctor if you are taking any medicines or supplements as they might interfere with the test results.

Q. What other tests can be prescribed by your doctor in case the result of the Phosphorus, Serum test is not normal?

Other tests that may be prescribed in case of an abnormal result of Phosphorus, Serum test include: blood calcium test, urine calcium test, vitamin D test, electrolyte panel test, kidney function test, liver function test, parathyroid hormone (PTH) test and blood sugar tests.
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Phosphorus, Serum test price for other cities

Price inBangaloreRs. 170
Price inMumbaiRs. 209
Price inKolkataRs. 209
Price inHyderabadRs. 209
Price inPuneRs. 209
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  1. Phosphorus [Internet]. NIH; 04 May. 2023. [Accessed 10 Jan. 2024]. Available from: https://ods.od.nih.gov/factsheets/Phosphorus-HealthProfessional/ External Link
  2. Phosphorus [Internet]. Harvard T.H. Chan; Mar. 2023 [Accessed 10 Jan. 2024]. Available from: https://www.hsph.harvard.edu/nutritionsource/phosphorus/ External Link
  3. Phosphorus [Internet]. Rochester, NY: University of Rochester Medical Center; [Accessed 10 Jan. 2024]. Available from: https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=167&contentid=phosphorus External Link
  4. Nadkarni GN, Uribarri J. Phosphorus and the kidney: What is known and what is needed. Adv Nutr. 2014 Jan 1;5(1):98-103. [Accessed 10 Jan. 2024]. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3884106/ External Link
  5. Qadeer HA, Bashir K. Physiology, Phosphate. [Updated 2023 Aug 28]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK560925/ External Link
  6. Goyal R, Jialal I. Hyperphosphatemia. [Updated 2023 Jun 12]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK551586/ External Link
  7. Sharma S, Hashmi MF, Castro D. Hypophosphatemia. [Updated 2022 Dec 26]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK493172/ External Link
  8. Bansal VK. Serum Inorganic Phosphorus. In: Walker HK, Hall WD, Hurst JW, editors. Clinical Methods: The History, Physical, and Laboratory Examinations. 3rd edition. Boston: Butterworths; 1990. Chapter 198. Available from: https://www.ncbi.nlm.nih.gov/books/NBK310/ External Link


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