Test Center

My Recent Searches

  • No Recent Search.

My Tests Viewed

  • No Test Viewed.
  • Ordering Info

Ammonia, Plasma [5509X]

Test Code

55098

CPT Code(s)

82140

Patient Preparation

Collect blood from stasis-free vein of patient (e.g., no tourniquet). Patient should not clench fist during collection, as muscular exertion often increases venous ammonia levels. Patient should avoid smoking before phlebotomy, since smoking increases plasma ammonia levels.

Preferred Specimen(s)

2 mL frozen plasma collected in an EDTA (lavender-top) tube

Minimum Volume

0.5 mL

Collection Instructions

Tubes should be filled completely and kept tightly stoppered at all times. Place immediately on ice. Separate plasma from cells within 20 minutes and freeze plasma immediately. Plasma other than EDTA is not acceptable.

Specimen Container

Plastic screw-cap vial

Transport Temperature

Frozen

Specimen Stability

Room temperature: Unacceptable
Refrigerated: Unacceptable
Frozen -20°C: 72 hours
Frozen -70°C: 7 days

Reject Criteria

Hemolysis • Lipemia • Received thawed • PPT Potassium EDTA (white-top) tube

Methodology

Enzymatic

Performing Laboratory

Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

Setup Schedule

Set up: Mon-Sat a.m., night, Sun night; Report available: Next day

Reference Range(s)

≤47 µmol/L

Clinical Significance

Ammonia is one of the by-products of protein metabolism. 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 blood ammonia has been reported in cardiac failure, azotemia, and pulmonary emphysema. Correlation between plasma ammonia and the degree of encephalopathy can be erratic.

LOINC®' Code(s)

The Result and LOINC information listed below should not be used for electronic interface maintenance with Quest Diagnostics. Please contact the Quest Diagnostics Connectivity Help Desk for more information at 800-697-9302.

NOTE: The codes listed in the table below are not orderable Test Codes.

Result
Code
Result NameLOINC CodeComponent Name
55098Ammonia (P)16362-6Ammonia

Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

LOINC assignment is based on a combination of test attributes, including the method used by the performing laboratory. For tests not performed by Quest Diagnostics, codes are assigned by the performing laboratory.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.