Phosphate in Blood
A phosphate test measures the amount of
phosphate in a blood sample. Phosphate is a charged
particle (ion) that contains the
mineral phosphorus. Phosphate levels are usually
higher in children than in adults because of the active bone growth occurring
Results are usually available in 1 to 2 hours.
The normal values listed here-called a reference range-are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what?s normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
High phosphate levels may be caused by:
Low phosphate levels may be caused by:
What Affects the Test
Results from a blood phosphate test may be affected by:
- Taking too
much vitamin D.
- Using some medicines that can decrease phosphate
levels, such as acetazolamide, and epinephrine. A large
infusion of sugar (glucose) that causes insulin levels to increase can also
decrease phosphate levels.
- Having a disease, such as
lymphoma, that causes calcium levels to rise or
What To Think About
- Results of a test to measure phosphate in blood
are not useful on their own. Other
electrolytes (such as calcium, chloride, magnesium,
potassium, and sodium) may also be measured. For more information, see the
Calcium in Blood,
Calcium in Urine,
- Other blood tests, such as a blood
urea nitrogen (BUN) test or a creatinine test, can also be used to check kidney
function. For more information, see the topics
Blood Urea Nitrogen and
Creatinine and Creatinine Clearance.
- Children with low phosphate levels may grow more
slowly than other children.
- Low phosphate levels may occur in
people who have
type 2 diabetes or when a person who has diabetic
ketoacidosis is being treated with