Ammonia, Plasma
Abbrev Code: | AMMON | ||
Order Code: | LAB47 | Order Name: | Ammonia |
Synonyms: | NH3 | ||
Methodology: | Roche: Enzymatic with glutamate dehydrogense (GLDH)
Woodwinds: Enzymatic (glutamate dehydrogenase) |
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CPT Codes: | 82140 x1, 82140 x1 | ||
Turnaround Time: | Performed and reported 24 hours/day. | ||
Special Instructions: | Delay in separation introduces more variation than delay in testing once separated. Process sample within 15 minutes of collection. Samples must be placed on wet ice immediately upon collection. Instant cold packs are unacceptable. | ||
Associated Links: |
Collection Instructions
Specimen: | Blood |
Optimal Volume: | 2.5 mL |
Minimum\Peds Volume: | 0.6 mL |
Collection Instructions: |
Chemistry Tests Containers Chart
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Causes for Rejection: | Hemolyzed, lipemic or grossly icteric specimens or specimens collected by capillary collection.
Whole blood not on placed on wet ice after collection. Whole blood samples not processed within 15 minutes of collection. Plasma samples greater than 2 hours old and/or not placed on wet ice and refrigerated. Frozen plasma more than 6 hours from collection (Non-Roche testing sites only). |
Processing and Shipping
Specimen Processing: | Within 15 minutes of collection, centrifuge and aliquot 1.25 mL, 0.2 mL minimum, at refrigerated temperature if possible. Place plasma on wet ice and refrigerate up to 2 hours. Alternatively, frozen samples are stable for 3 days at -20 (Roche) or 6 hours at -20 (Non-Roche). Do not freeze the original collection container. |
Shipping Instructions: | Ship plasma at refrigerated temperature on wet ice to arrive within 2 hours of collection.
Outreach clients: Freeze samples at -20 and ship to arrive within 3 days to a Roche site. For Non-Roche sites, freeze at -20 and ship to arrive within 6 hours of collection. |
Stability: | Roche: 30 minutes at room temperature; 2 hours refrigerated; 3 days frozen at -20; 4 weeks frozen at -60. |
Test Performed at or Referral Lab | Chemistry (Roche-CSC Mpls, Roche-Grand Itasca, Roche-Lakes, Roche-Northland, Roche-Range, Roche-Ridges, Roche-Southdale, Roche-St. John's, Roche-UMMC East, Roche-UMMC West, Woodwinds) |
Interpretive
Critical Range: | Greater than 100 umol/L |
Reference Range: | Roche: Female: 11-51 umol/L; Male: 10-60 umol/L
Woodwinds: 11-35 umol/L |
Use: | Evaluation of suspected hepatic disease. |
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