Diagnostic Test Directory

Clinical Chemistry Laboratory

Ammonia

  • LIS Mnemonic: NH3

    Collect

    Light Green (PST - Lithium heparin)

    Volume Required

    1 mL whole blood

    Minimum Required

    0.5 mL whole blood

    Transport

    On ice

    Stability

    post centrifuged, 3hrs refrigerated and 24 hours frozen

    Processing

    Centrifuge PST promptly in refrigerated centrifuge at 3400 RPM for 10 min. If there is not gel separating the plasma from the red cells, transfer the plasma using a disposable pipette to another tube (pour off tube) being careful not to disturb the buffy coat. Rubber band the original tube (parent tube) with the labeled pour off tube prior to sending the specimen to CLS.

    Unacceptable conditions

    Transport without ice.Specimen collected in a SST tube.

Days Performed

24/7

Reported

Stat: 45 Min. Routine: 90 Min.

Reflex Testing

N/A

CPT

82140

Methodology

Colorimetric

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