What is this test?
Phosphate is a mineral involved in bones, energy production and cell function. Blood levels are regulated by the kidneys, parathyroid hormone, vitamin D and nutrition.
Why might it be ordered?
- To assess bone-mineral, kidney or parathyroid disorders.
- To monitor a condition or treatment that can disturb phosphate.
What sample is needed?
A blood sample is required. The laboratory chooses the correct tube and handles the sample for this test.
How should you prepare?
Ask the laboratory whether you need to fast or attend at a particular time. Do not stop or change medicines or supplements unless your clinician tells you to.
How should you understand the result?
Timing, meals, kidney function and other minerals affect the result. Calcium, magnesium, vitamin D and parathyroid hormone may be needed for context.
Sources and editorial status
This patient-facing text is an editorial draft. It should be approved by a laboratory physician before official publication.