Quality Checks - MicroLab 3500 Mark 6 Spirometer  The acceptability of an individual spirometry manoeuvre is judged for quality according to the ATS/ERS  2005 Standard on Standardization of Spirometry. A good forced manoeuvre should mean that the air from  the lungs is ‘blasted’ out and continued right to the end of the blow, until no further air can be exhaled.  Good Blow is defined as one that is greater than 3 seconds duration with no change in volume for at  least one second. It is recommended that a blow should last for a minimum of 6 seconds or until the  volume time trace shows that an obvious plateau has been reached.  Abrupt End  This warning appears when the forced expiratory time (FET) is less then six seconds and the change in  exhaled volume during the last half second is more than 100ml. This indicates that the patient stopped  exhaling prematurely.  Poor Effort  This warning appears when the time to peak flow (PEFT) is less than 120ms. It indicates a sluggish effort  during the forced expiration manoeuvre.  Possible Cough  This warning appears when there is a secondary peak after the peak flow. This normally happens when  the patient coughs during the forced expiratory manoeuvre.  Short Blow  This warning appears when the forced expiratory time was less then two seconds. This indicates that the  patient may not have exhaled all the air out of the lungs and would not be classified as a satisfactory  exhalation.  Slow Start  This warning appears when the back-extrapolated volume is less than 5% or 150ml of FVC, whichever is  greater. This indicates that the patient did not blast out the air quickly and evenly during the forced  expiration.
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