[Quality control in acid-base and gas analysis of the blood]

The data from the intra-laboratory qualitative control art analyzed--accuracy and reproducibility of the results from the determinations of pH, pCO2 and pO2. Reproducibility is followed day by day and the accuracy of the results from the determinations of pH, pCO2, and pO2. The determinations were performed as follows: pH--by micro-electrode, pCO2--by equilibrium and by selective electrode, pO2--by electrode, Clark type with apparatuses VME 22, VME 32 and automatic analyser for blood-gas analysis ABL 2 (Radiometer). Acidbasol and Versatol Acid-Base were used as control materials in the three ranges: normal, acid and alkaline. Reproducibility of the results as regards time, presented by variation coefficient (VC), followed up for a period of 9 months by the control materials Acidbasol with ABL 2 apparatus proved to be very good in the three ranges tested for pH and pCO2. Results dispersion is higher with pO2 determinations, even higher with the low values. The accuracy of the results from pH and pCO2, determinations for the same period was within the allowable limits. A very good reproducibility of pH and pCO2 was indicated by the reproducibility data in time of the results from pH and pCO2 determinations from one year with the three apparatuses, making use of the control serum Versatol Acid-Base for the three ranges. Better variation coefficients by equilibrium method were established for the higher values of pCO2 with its automatic determination. High reliability of the investigation methods was established be the results from the systematic qualitative control of acid-base and blood-gas parameters.