Peak Expiratory Flow (PEFR)

Peak expiratory flow (PEFR) refers to the maximum expiratory flow rate during the determination of forced vital capacity (FVC). During the examination: Inhale as much as possible to inhale, and exhale as much as possible to exhale the air, so as not to affect the inspection results. Basic Information Specialist classification: Respiratory examination classification: pulmonary function test Applicable gender: whether men and women apply fasting: not fasting Tips: Relax before you check and do not exercise vigorously. Normal value Normal reference value: about 5.5L/S (liters per second). Clinical significance Abnormal results: It needs to be judged comprehensively with other lung function tests. People who need to be tested: 1. Patients suspected of having bronchial asthma. 2. Determine the condition and efficacy of patients with bronchial asthma. 3. Patients with suspected atmospheric dysfunction are suspected. Precautions Before the test: To relax properly, do not exercise vigorously. During the examination: Inhale as much as possible to inhale, and exhale as much as possible to exhale the air, so as not to affect the inspection results. Inspection process The subject took the standing position, pinched the nose, placed the mouth with the tube, first calmed the breath several times, and the subject took a deep inhalation to the lung total position, and then immediately exhaled with the maximum strength and the fastest speed until the residual gas The position can be measured by a conventional pulmonary function meter or by a micro-maximum expiratory flow meter (or peak flow meter). When the peak flow meter is measured, the PEF is displayed by the liquid crystal digital display or the pointer scale. Repeat once every 5 to 10 minutes, at least 3 times, and select the maximum PEF. Not suitable for the crowd 1. Large hemoptysis stopped for more than 2 weeks as a contraindication. 2. Severe emphysema, pulmonary bullae, acute exacerbation of pulmonary heart disease, asthma attack, and various acute respiratory infections are relative contraindications. 3. Fiberoptic bronchoscopy (especially biopsy) is a relative contraindication, but can still be examined after 3 to 5 days. 4. Those with important organ failure. 5. Bronchial pleural fistula, pneumothorax and tracheotomy are not closed. Adverse reactions and risks Generally no complications and harm.

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