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Ronan Asked :

21-11-2021 Spirometry

Q. 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 ml

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Dapzoi Verified
Commented on 2021-11-21 12:21:18 (IST)
Answer: D

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.