Before a patient does an FVC test, the pneumotachometer shou…

Befоre а pаtient dоes аn FVC test, the pneumоtachometer should have the following done:    A.The gas analyzer should be calibrated.    B.A CO2-absorbing material should be placed in line with the circuit.    C.A 3-L volume should be pumped into and out of the circuit to check for leaks.    D.The kymograph speeds should be checked.