PFT Acceptability criteria

Question 1

Between test acceptability criteria for Slow Vital Capacity (SVC)?

Answer 1

2 acceptable VC’s obtained, volumes within 150 ml (use the 2 largest)

• SVC is also known as VC

Question 2

Between test acceptability criteria for FVC?

Answer 2

3 acceptable maneuvers need to be present with 2 largest being within 0.150L of on another

• Peds have a different value
• BEV <5% or 150ml

Question 3

Between test acceptability criteria for FEV1?

Answer 3

3 acceptable maneuvers need to be present with the 2 largest being within 0.150L

Question 4

Between test acceptability criteria for Specific Airway resistance (RAW) and specific airway conductance (sGAW)?

Answer 4

3 acceptable efforts need to be present with <10% variability between 1 another

Question 5

Between test acceptability criteria for Nitrogen washout?

Answer 5

Only 1 acceptable test needed

• If > 1 test done, acceptable tests should be within 10% of another
• Washout time = 3-4 minutes

Question 6

Between test acceptability criteria for DLCO?

Answer 6

2 acceptable tests are required and should be within 2 mL CO/min/mmHg of one another or within 10% of the highest value

Question 7

Between test acceptability criteria for He Dilution?

Answer 7

only 1 acceptable test needed.

• If >1 test done, acceptable tests should be within 10% of one another

Question 8

Between test acceptability criteria for MIP and MEP?

Answer 8

At least 3 efforts should be completed with < 20% variability between them all

• Best 2 within 10%

Question 9

What is the general rest period for between maneuver evaluation?

Answer 9

Rest period of >/= to 1 min between tests

Question 10

How long should inhaled drugs be stopped before PFT testing?

Answer 10

No short acting inhaled drugs 4 hours prior, oral therapy, and any LABA should not be taken 12 hours to testing.

• could affect reversibility testing

Question 11

Acceptability FVC

Answer 11

BEV <5%
No cough in first second of expiration
no glottic closure (1sec for FEV 1)
Achieve one of:

• expiratory plateau
• expiratory time >15s
• FVC within the repeatability or larger and last one
• No leak or obstructive mouthpiece

Question 12

Repeatability FVC

Answer 12

3 tests meet acceptability

• TWO largest FVC with <150ml
• TWO largest FEV1 within <150ml

Question 12

FVL acceptability

Answer 12

Same as FVC
BEV <5%
No cough in first second of expiration
no glottic closure (1sec for FEV 1)

Achieve one of:

• expiratory plateau
• expiratory time >15s
• FVC within the repeatability or larger and last one
• No leak or obstructive mouthpiece

Question 12

FVL reproducibility

Answer 12

BEV <5%
No cough in first second of expiration
no glottic closure (1sec for FEV 1)
Achieve one of:
- expiratory plateau
- expiratory time >15s
- FVC within the repeatability or larger and last one
No leak or obstructive mouthpiece

Question 13

Acceptability PEF

Answer 13

good seal
no hesitation
no cough

Question 14

Reproducibility PEF

Answer 14

minimum 3 tests
largest TWO within 0.67L/sec
Record values and order

Question 15

Acceptability MVV

Answer 15

goal 50% of VC

• 90br/min
• max effort, no leaks, no hesitation
• 2 acceptable maneuvers, MVV are within 10%

Question 16

MVV Reproducibility

Answer 16

Need two acceptable manoeuvres
variability <20%

Question 17

Repeatability of FRC

Answer 17

At least 3 FRCpleth values within 5% of eachother

Question 18

Predicted MVV?

Answer 18

40xFEV1