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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