How much amount of capillary blood is required by a micro-electrode for determination of pH?(a) 5 to 10 ml(b) 10 to 12 ml(c) 12 to 18 ml(d) 20 to 25 mlThe question was asked during an interview.My doubt stems from Spirometry topic in chapter Pulmonary Function Analysers of Biomedical Instrumentation

How much amount of capillary blood is required by a micro-electrode fo

1.	How much amount of capillary blood is required by a micro-electrode for determination of pH?(a) 5 to 10 ml(b) 10 to 12 ml(c) 12 to 18 ml(d) 20 to 25 mlThe question was asked during an interview.My doubt stems from Spirometry topic in chapter Pulmonary Function Analysers of Biomedical Instrumentation
Answer» The correct option is (d) 20 to 25 ML Explanation: A micro-electrode for clinical applications requires only 20–25 ml of CAPILLARY blood for the determination of pH. The electrode is enclosed in a water jacket with circulating water at a constant temperature of 38°C. The water contains 1% NACI for SHIELDING against static interference.

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