LabCorp Test

Phosphorus Serum Test

Quick Overview

Phosphorus testing may be performed to measure high or low levels of phosphorus to determine a variety of differential diagnoses such as: dehydration, renal disease, liver disease, diabetic ketoacidosis. Phosphate levels may increase during the last trimester of pregnancy.

Test #001024


Availability: In stock

Also Known As Inorganic Phosphate, Blood; Phosphate; P; Phos; PO4
Preparation Fasting for 10-12 hours required.
Test Results 1-2 days. May take longer based on weather, holiday or lab delays.

Phosphorus is an important element that is vital to several of your body’s physiologic processes. It helps with bone growth, energy storage, and nerve and muscle production.  The majority of phosphorus in the body combines with calcium to form bones and teeth.  Phosphorus also plays a key role in maintaining the body's acid-base balance.


Symptoms that may indicate your phosphorus level is too low include:

  • changes in your mental state (e.g. anxiety, irritability, or confusion)
  • bone issues, such as pain, fragility, and poor development (in children)
  • irregular breathing
  • fatigue
  • loss of appetite
  • muscle weakness
  • weight gain or loss

If the level of phosphorus in your blood is too high, you may have deposits of phosphorus (combined with calcium) in your muscles. This is rare and only occurs in people with severe calcium absorption or kidney problems. More commonly, excess phosphorus leads to cardiovascular disease or osteoporosis (weakening of your bones).

Abnormal levels of phosphorus may be indicative of kidney damage, malnutrition, malabsorption, and high or low calcium levels.
Phosphorus testing is typically ordered when someone has symptoms of kidney disease, gastrointestinal disorders, diabetes or an acid-base imbalance.

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