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Clinical Chemistry 24: 2172-2175, 1978;
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Clinical Chemistry, Vol 24, 2172-2175, Copyright © 1978 by American Association for Clinical Chemistry

Modified micro-scale enzymatic method for plasma ammonia in newborn and pediatric patients; comparison with a modified cation-exchange procedure

J Wu, KO Ash and E Mao

We modified two "kit" procedures for plasma ammonia to make them suitable for use with newborn and pediatric patients. Available methods either require too large a specimen, are insufficiently sensitive in the normal range, or are too cumbersome. One was an enzymatic (Sigma Chemical Co., St. Louis, Mo. 63178), the other a cation-exchange (Hyland, Costa Mesa, Calif. 92626) method. The modified micro-scale enzymatic method requires 100 microliter of plasma (CV at 38 micronmol/liter, 8%). Reagent costs per patient assay, including controls and standards, are currently $0.53. An assay run can be completed in 30 min. The modified cation-exchange method requires 200 microliter of plasma; the within-run CV is 12% for a concentration of 34.2 micronmol/liter. Reagents currently cost $0.74 per assay and each run requires less than 2 h to complete. The correlation coefficient for the two methods was 0.98.




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Copyright © 1978 by the American Association for Clinical Chemistry.