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Microscale modification of a cation-exchange column procedure for plasma ammonia
Clinical Chemistry
|December 1, 1976
Summary
This study presents a refined cation-exchange resin method for measuring plasma ammonia using minimal sample volume. The new procedure significantly improves analytical recovery and provides reliable ammonia concentration data for various age groups.
Area of Science:
- Clinical Chemistry
- Analytical Biochemistry
- Biomedical Science
Background:
- Plasma ammonia levels are critical indicators in various physiological and pathological conditions.
- Accurate and efficient measurement of ammonia is essential for clinical diagnostics.
- Existing methods for plasma ammonia determination can be labor-intensive and require larger sample volumes.
Purpose of the Study:
- To develop and validate a modified column cation-exchange resin procedure for plasma ammonia determination.
- To reduce the required plasma volume for ammonia analysis.
- To assess the accuracy, recovery, and reliability of the new method across different sample types and age groups.
Main Methods:
- Modification of a column cation-exchange resin procedure to require only 100 µL of plasma.
- Evaluation of analytical recovery using standards and plasma samples.
- Determination of plasma ammonia concentrations in adults, newborns, infants, and children.
- Comparison of venous and capillary plasma ammonia values.
- Investigation of the effects of storage time and temperature on plasma ammonia stability.
Main Results:
- The modified procedure achieved a mean analytical recovery of 98% for standards from resin, significantly higher than the 63% from a batch procedure.
- Analytical recovery of standards from plasma was complete (mean 103%).
- Mean plasma ammonia concentrations were established for adults (16 µmol/L), newborns (60 µmol/L), and a range of infants and children.
- Higher ammonia values were observed in capillary plasma compared to venous plasma.
Conclusions:
- The modified cation-exchange resin method offers a more accurate and efficient approach for plasma ammonia measurement.
- The reduced sample volume requirement makes the method suitable for pediatric and neonatal samples.
- The study provides reference values for plasma ammonia across different age groups and highlights factors affecting sample integrity.