CPFT/RPFT KETTERING
CALCULATIONS EXAM QUESTIONS
AND ANSWERS. VERIFIED 2025/2026.
Calibration of Blood Gas Electrode (PCO2 and PO2) - ANS (PB - PH2O) x Fractional
Concentration of Gas
(decimal)
Converting Inches to Centimeters - ANS Inches x 2.54 inches
Smoking History in Pack Years - ANS # of packs/day x # of years Smoked
Minute Volume (VE) - ANS Tidal Volume (VT) x Respiratory Rate
Inspiratory Reserve Volume (IRV) - ANS IC - VT or
VC - ERV - VT
Expiratory Reserve Volume (ERV) - ANS VC - IC or
FRC - RV
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Inspiratory Capacity (IC) - ANS IRV + VT or
VC - ERV or
TLC - FRC
Vital Capacity (VC) - ANS IRV + VT + ERV or
IC + ERV or
TLC - RV
Tidal Volume (VT) - ANS IC - IRV or
VC - IRV - ERV or
TLC - IRV - ERV -RV
FEV1/FVC% - ANS FEV1 / FVC x 100
Maximum Voluntary Ventilation (MVV) - ANS # Breaths x Volume of Each Breath x 5
(For a 12 second effort)
Estimate of MVV Effort - ANS FEV1 x 40
FEF50% / FIF50% ratio - ANS FEF50% / FIF 50%
Post Bronchodilator % Change - ANS (Post FEV1 - Pre FEV1) / Pre FEV1 x 100
% of Predicted - ANS Measured Value / Predicted Value x 100
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
CALCULATIONS EXAM QUESTIONS
AND ANSWERS. VERIFIED 2025/2026.
Calibration of Blood Gas Electrode (PCO2 and PO2) - ANS (PB - PH2O) x Fractional
Concentration of Gas
(decimal)
Converting Inches to Centimeters - ANS Inches x 2.54 inches
Smoking History in Pack Years - ANS # of packs/day x # of years Smoked
Minute Volume (VE) - ANS Tidal Volume (VT) x Respiratory Rate
Inspiratory Reserve Volume (IRV) - ANS IC - VT or
VC - ERV - VT
Expiratory Reserve Volume (ERV) - ANS VC - IC or
FRC - RV
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, Inspiratory Capacity (IC) - ANS IRV + VT or
VC - ERV or
TLC - FRC
Vital Capacity (VC) - ANS IRV + VT + ERV or
IC + ERV or
TLC - RV
Tidal Volume (VT) - ANS IC - IRV or
VC - IRV - ERV or
TLC - IRV - ERV -RV
FEV1/FVC% - ANS FEV1 / FVC x 100
Maximum Voluntary Ventilation (MVV) - ANS # Breaths x Volume of Each Breath x 5
(For a 12 second effort)
Estimate of MVV Effort - ANS FEV1 x 40
FEF50% / FIF50% ratio - ANS FEF50% / FIF 50%
Post Bronchodilator % Change - ANS (Post FEV1 - Pre FEV1) / Pre FEV1 x 100
% of Predicted - ANS Measured Value / Predicted Value x 100
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.