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Chemistry & Basic Tests
Ammonia
Measures ammonia levels to assess liver function and diagnose hepatic encephalopathy.
CPT code
82140
Turnaround time
24–72 hours
Fasting required
No fasting needed
Collection container
Light Green Top (PST)
About this test
Measures ammonia levels to assess liver function and diagnose hepatic encephalopathy.
Specimen requirements
Collection container
Light Green Top (PST)
lightgreen top
Specimen
Serum
How to prepare
- 1
Bring a valid photo ID to your appointment
- 2
Plan for a 15–30 minute visit
Special instructions
Specimen must be spun down, serum separated, and immediately on ice/frozen