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Test Name:Ammonia  
Epic Order Code:LAB47  
CPT Code:82140  
Specimen(s) Type:Plasma  
Acceptable Container(s):Top is purple (lavender)
Testing Schedule:24 hrs/day, 7 days/week
Turn Around Time:STAT: 1 hour
 Routine: 2 hours
Collection Information:No special patient preparation is required. Obtain by standard collection procedures. Fill tube completely and keep tightly stoppered. Place on ice immediately.
Transport Information:Deliver to lab immediately on ice. All specimens must be signed into the laboratory.
Reference Clients:If unable to deliver to the lab within 20 minutes, centrifuge the specimen and remove plasma from the red cells. Keep container tightly capped. Store and transport at -20° C. Specimen must be received in the lab within 24 hours.
Causes for Rejection:Improperly labeled, incorrect container, contaminated, insufficient quantity, incorrect/delay in transport.
Reference Range:Males:16-60 µmol/L 
 Females:11-51 µmol/L 
Additional Information:One known source of spontaneous ammonia formation is an increased gamma-glutamyl transferase activity leading to decomposition of glutamine.