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Phosphate (Urine)

Clinical Biochemistry

Sample and container requirements

Plain 24 hr Urine

Minimum volume required

Special requirements

Acidify urine in the laboratory (24hr urine acidified by adding 400 uL of 3M HCL)

Patient preparation

None

Sample viability

Turnaround time

This assay is run daily Monday - Friday. Turnaround time is normally less than 24 hours

Reference range

15 – 50 mmol/24hr (Source: Pathology Harmony Recommendations)

Clinical guidance

Phosphate is important for bone metabolism. Most of the body's phosphate (85%) is located in the skeletal system, where it combines with calcium to give bones their structure. It also plays an important role in the formation of key nucleic acids, such as DNA, and in the process of generating energy from food (metabolism). Please refer to LabTestsOnlineUK to learn more about phosphate. https://labtestsonline.org.uk/tests/phosphate

Notes

Images to go here

This information was last updated on 19 August 2026