Anatomical dead space measured by -
(A) Bohler's method (B) Xenon dilution technique (C) Spirometry (D) Single breath nitrogen test
(D) Ans. D. Single breath nitrogen test(Ref: Ganong 25/e p633, 634, 24/e p633, 634)Anatomical dead space - Calculation:By Bohr's equation - Uses single breath nitrogen inhalation technique.Xenon/Helium dilution technique:Used to measure functional residual capacity of lung.Spirometry:Cannot measure residual or dead space volumes.