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Geisinger Medical Laboratories Test Catalog
AMMONIA |
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Geisinger Epic Procedure Code: LAB1732
Geisinger Epic ID: 6457
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SPECIMEN COLLECTION |
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Specimen type: |
Plasma | |
Preferred collection container: |
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Specimen required: |
1 mL aliquot plasma; minimum 0.5 mL | |
Special notes: |
Mix well. Place specimen immediately into an ice slurry. See Processing Instructions below. | |
| SPECIMEN PROCESSING |
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Specimen processing instructions: |
Centrifuge (cold if possible) to separate plasma. Place specimen on ice and assay immediately. Exposure to air should be minimized. For off-campus laboratory, separate plasma immediately upon centrifugation. Freeze plasma at -20°C (-70°C is acceptable). | |
Transport temperature: |
Refrigerated or frozen. | |
Specimen stability: |
Refrigerated: 2 hours. Frozen: 3 days. | |
Rejection criteria: |
Hemolyzed specimens are not acceptable. | |
TEST DETAILS |
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Reference interval: |
Ammonia (umol/L) 0 to 14 days: 56-107 15 days to < 2 years: 40-80 2 years and above: 11-35 |
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Critical values/courtesy alerts: |
Above 80 umol/L | |
CPT code(s): |
82140 | |
| Note: The billing party has sole responsibility for CPT coding. Any questions regarding coding should be directed to the payer being billed. The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only. | ||
Test includes: |
Ammonia. | |
Methodology: |
Enzymatic method with glutamate dehydrogenase |
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Synonyms: |
NH3, AMON
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Clinical significance: |
Elevated blood ammonia levels have been associated with severe liver dysfunction such as hepatic encephalopathy, coma resulting from cirrhosis, severe hepatitis, Reye's syndrome, and drug hepatotoxicity. Also, elevated ammonia has been reported in cardiac failure, azotemia, and pulmonary emphysema. | |
Doctoral Director(s:) |
Hoi-Ying Elsie Yu, PhD, DABCC, FADLM Sheng-Ying (Margaret) Lo, PhD, DABCC |
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| Review Date: | 12/14/2022 | |
Performing Locations
Geisinger Wyoming Valley Medical Center
Geisinger Shamokin Area Community Hospital
Geisinger Community Medical Center
Geisinger Medical Center Muncy