Newcastle Laboratories

Calcium (Ionised), serum

Clinical Background:

Ionised calcium is the physiologically active form of calcium circulating in the body, approximately 47% of the total.

Ionised calcium is the physiologically active form of calcium circulating in the body, approximately 47% of the total.

Test Details

  • Discipline:

    Biochemistry

    Biochemistry

  • Specimen Container Adult:

    Serum (SST or plain tube)

    Serum (SST or plain tube)

  • Specimen Container Paediatric:

    serum (SST or plain tube)

    serum (SST or plain tube)

  • Minimum Volume Adult:

    2 mL blood

    2 mL blood

  • Minimum Volume Paediatric:

    1 mL blood

    1 mL blood

  • Special Requirement:

    Collect without venous stasis, anaerobically into Vacutainers or a plain or heparinised tube completely filled.

    Collect without venous stasis, anaerobically into Vacutainers or a plain or heparinised tube completely filled.

  • Sample Stability:

    Stable in whole blood for 24h at 4°C.

    Stable in whole blood for 24h at 4°C.

  • Reference Ranges:

    >1 year: 1.15 - 1.27 mmol/L

    >1 year: 1.15 - 1.27 mmol/L

  • Factors Affecting Result:

    EDTA, oxalate and citrated samples are unsuitable
    The distribution of calcium between being protein‐bound or in free solution is dependent on H+ concentration (pH). Because this can change in vitro...

    EDTA, oxalate and citrated samples are unsuitable
    The distribution of calcium between being protein‐bound or in free solution is dependent on H+ concentration (pH). Because this can change in vitro,
    measurements of free calcium should be made rapidly after the blood has been drawn and ideally be peformed within 30 minutes, longer if the sample is kept at 4ºC.

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  • Other Info:

    lithium heparin plasma sample also acceptable

    lithium heparin plasma sample also acceptable

  • Routine Contact Name:

    Duty Biochemist

  • Routine Telephone:

    Freeman: 0191 244 8889
    RVI: 0191 282 9719

    Freeman: 0191 244 8889
    RVI: 0191 282 9719

  • Routine Email:

Availability:

24/7, analysed at RVI and Freeman

Turn Around:

Within 1 hour

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