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        Vitamin B12

        Clinical Biochemistry

        Sample and container requirements

        Serum Lithium Heparin Plasma (paediatrics only)

        Minimum volume required

        Special requirements

        None

        Patient preparation

        Sample viability

        Turnaround time

        This assay is run throughout the day and night. The in-lab turnaround time is normally less than 24 hours.

        Reference range

        187 – 883 ng/L (Source: Abbott Diagnostics) Refer to NICE NG239 for interpretation of results

        Clinical guidance

        The primary functions of Vitamin B12 are in the formation of red blood cells and the maintenance of a healthy nervous system. Please refer to LabTestsOnlineUK to learn more about B12. https://labtestsonline.org.uk/tests/vitamin-b12-and-folate

        Notes

        Images to go here

        This information was last updated on 19 August 2026