A newly posted junior doctor had difficulty in finding out	base deficit/excess for blood	in	a given patient. An	experienced senior resident advised a quick method to determine acid base composition of blood based on pCO2. Which of the following is the likely method he suggested to predict acid base composition of blood: (A) Red ford nomogram, (B) DuBio’s nomogram, (C) Goldman constant field equation, (D) Siggard-Andersen nomogram
Answer is D. Ref: Ganong 19/e p703 fig 39.8
 

Siggard-Anderson nomogram: plots the acid-base charecteristics of arterial blood
PCO2 is placed on the vertical axis and pH on the horizontal axis


Vertical line through pH 7.40: any point to the left denotes acidosis & any point to right denotes alkalosis
Horizontal line through p CO2 of 40 mmHg: point above or below this line defines the effective degree of hypo or hyperventilation