In investigating a patient’s acid-base status
A. Venous rather than arterial blood should be studied.
B. Blood samples may be stored for up to 12 hours at room temperature before analysis.
C. pH can be calculated if [HCO3 ] and PCO2 are known.
D. Raised urinary ammonium salts suggest renal compensation for respiratory acidosis.
E. An early fall in [HCO3 ] suggests that the acid-base disturbance is respiratory in origin.

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