A phosphate test is used to measure the level of phosphate in the blood.
Phosphate is a chemical that contains the mineral phosphorus.
Phosphate tests are very useful for measuring phosphate levels inmalnourished people (where their diet doesn't contain the right amount of nutrients to meet their body's demands).
A phosphate test can also be used to test people being treated for a condition called ketoacidosis, which sometimes affects people withdiabetes.
If you have ketoacidosis, your body can't use blood glucose as an energy source because of a lack of insulin (a hormone that controls blood sugar levels).
Another use of phosphate tests is to help diagnose digestive system disorders that interfere with the absorption of phosphate, calcium and magnesium.