ATS Pulmonary Function Laboratory Manual

ATS Pulmonary Function Laboratory Management & Procedure Manual | 3rd Edition

FVC Closed-Circuit Testing

Step Action 1.

Have the patient assume the correct posture.

2. Attach the nose clip, place mouthpiece in mouth and instruct patient to close lips around the mouth- piece and breathe quietly. 3. Instruct the patient to inhale completely and rapidly with little or no pause (< 1–2 sec) at TLC. 4. Instruct patient to exhale maximally until no more air can be expelled. 5. Repeat instructions as necessary, coaching vigorously during the expiratory maneuver. 6. Repeat for a minimum of three acceptable test maneuvers, no more than eight are usually required. 7. Check test session repeatability: the two largest FVC values are to be within 0.150 L of each other, and the two largest FEV 1 values are to be within 0.150 L of each other. If the FVC ≤ 1.00 L, repeatability for both FVC and FEV 1 values is to be within 0.100 L. Perform more test maneuvers as necessary to achieve repeatability.

FVC Open-Circuit Testing

Step Action 1.

Have patient assume the correct position.

2.

Attach nose clip.

3. Instruct the patient to inhale completely and rapidly with little or no pause at TLC (< 1 sec). 4. Instruct the patient to place the mouthpiece in mouth and close lips around the mouthpiece, while holding their lungs full. 5. Instruct patient to exhale maximally until no more air can be expelled. 6. Repeat instructions as necessary, coaching vigorously. 7. Repeat for a minimum of three maneuvers, no more than eight are usually required. 8. Check test session repeatability: the two largest FVC values are to be within 0.150 L of each other, and the two largest FEV 1 values are to be within 0.150 L of each other. If the FVC ≤ 1.00 L, repeatability for both FVC and FEV 1 values is to be within 0.100 L. Perform more test maneuvers as necessary to achieve repeatability.

MVV

Step Action 1.

Have patient sit at the spirometer.

2. Attach the nose clip, place mouthpiece in mouth and instruct patient to close lips around the mouth- piece and breathe quietly. (continues on next page)

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