Ammonia, Plasma

Single-analyte tests

• Ammonia, Plasma 007054

  Plasma · Fasting not stated · Turnaround 1 - 2 days

  Method and collection

  Method

  Enzymatic

  Preparation

  Patient should be fasting 12 to 14 hours to avoid lipemia, which interferes with the test.

  Collection

  Tube must be filled completely and kept tightly stoppered at all times. Mix well. Specimen must be placed on ice immediately. Separate plasma from cells within 15 minutes of collection. Patient should not clench fist. Transfer specimen to a plastic transport tube before freezing. Avoid contamination of samples by ammonia from smoking or traffic in the laboratory or patient's room, glassware, or water. To avoid delays in turnaround time when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested .

  Reference notes

  See table. Age Male (µg/dL) Female (µg/dL) 0 to 30 d Not established Not established 1 to 6 m 42–137 42–137 7 m to 1 y 34–108 34–108 2 to 12 y 33–97 33–97 13 to 30 y 36–136 29–112 31 to 40 y 40–160 30–130 41 to 50 y 40–200 31–155 51 to 70 y 40–200 34–178 71 to 80 y 31–169 31–169 >80 y 28–135 28–135

  Labcorp catalog page

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Single-analyte tests

• Ammonia, Plasma 5509

  Plasma · Fasting not stated · Turnaround Set up: Mon-Fri; Report available: 5 days

  Method and collection

  Method

  Enzymatic

  Collection

  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 prior to phlebotomy since smoking increases plasma ammonia levels. Tubes should be filled completely and kept tightly stoppered at all times. Place immediately on ice. Separate plasma from cells within 15 minutes and freeze plasma immediately.

  Reference notes

  ≤72 umol/L

  Quest Diagnostics catalog page

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