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Test Code LAB1774 Ammonia, Plasma

Performing Section

Chemistry

Purpose/Principle

Quantitatively measure ammonia concentration in plasma.

Special Collection Notes

No CAPILLARY COLLECTIONS- must be collected by venipuncture. Best to collect without tourniquet, if one is used, place lightly and collect specimen within 1 minute. Collect on ICE. Cannot share containers with any other test.

Specimen Type

Plasma:
Green Top – Li Heparin (Preferred)
Purple Top – EDTA

Specimen Volume

Preferred: 1.2 mL
Minimum: 0.6 mL

Processing Instructions

Spin down ASAP, keep sample on ice if delayed. Pipette off plasma into pour off tube and freeze.
Store and send sample Frozen on ice, STAT via courier.

Temperature

Frozen

Test Components

Hemolysis Index
Icterus Index
Turbidity Index
Ammonia

Reference Range

Hemolysis Index

This component has no reference ranges

 

Icterus Index

This component has no reference ranges

 

Turbidity Index

This component has no reference ranges

 

Ammonia

0-up to1day: 64-107 mcmol/L

1 day-up to 14 days: 56-92 mcmol/L

14 days up to 18 years: 21-50 mcmol/L

18 years and older: 9-33 mcmol/L

TAT

15 minutes

Sample Stability

Ambient: Not recommended
Refrigerated: 3 hours
Frozen: 24 hours

Additional Notes

Specimen will be rejected if hemolyzed.

Aliases

NH3
Plasma ammonia level

CPT

82140

Test/Batch Schedule

Daily

Method

Vitros