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0. Look at graph
1. Look for obstruction
 Decrease inFEV1/FVC
2. Look for degree of obstruction
 Decrease inFEV1
 Ameri...
VerySevere <35%
3. Look for significantBDchanges - Indicative of asthma
 >12% or 200mL change
4. Look for restriction(Not...
8. Look at MIP/MEP (afterrestrictionisconfirmed)
 Decrease inMIP/MEP indicatesneuromusculardisease
 Normal MIP/MEP - Obe...
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Step by step guide in reading PFT

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Step by step guide in reading PFT

  1. 1. 0. Look at graph 1. Look for obstruction  Decrease inFEV1/FVC 2. Look for degree of obstruction  Decrease inFEV1  AmericanthoracicSocietyguideline Degree of obstruction FEV1 value Mild >70% Moderate 60-69% ModeratelySevere 50-59% Severe 35-49%
  2. 2. VerySevere <35% 3. Look for significantBDchanges - Indicative of asthma  >12% or 200mL change 4. Look for restriction(Note:restrictive diseaserequiresdecreaseinbothFVCandTLC)  Decrease inFVC Degree of restriction FVCvalue Mild 60-80% Moderate 50-60% Severe <50% 5. Look at DLCO - indicatesproblemsingasexchange toblood Degree of gas exchange DLCO value Mild >60% Moderate 40-60% Severe <40% 6. If decrease inDLCOlookat KCO  DLCO isnot accurate  KCO- calibratedwithalveolarvolume  Asthmatic- eithernormal DLCOor low DLCO but normal KCO  Emphysema- lowDLCO and low KCO 7. Look for gas trappingandhyperinflation  Gas trapping- increase inRV and/ordecrease inFVC  Hyperinflation - increase inTLC
  3. 3. 8. Look at MIP/MEP (afterrestrictionisconfirmed)  Decrease inMIP/MEP indicatesneuromusculardisease  Normal MIP/MEP - Obesity,chestwall NOTE: normal FVCand normal TLC can indicate non-specificpattern(70% obstructionand30% restrictive disease)

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