Medically reviewed by Daniel More, MD A peak flow meter is used to measure your peak expiratory flow rate (PEFR). PEFR describes how quickly your lungs expel air during a forceful exhalation after ...

PEFR stands for peak expiratory flow rate. It's a test that measures how fast you can exhale. Learn more about PEFR, why your doctor may suggest this test, how to prepare, what to expect, and ...

Peak flow rates increased to 19 and 19.9 mL/sec at three and six months, respectively. Post-void residual volumes fell to 40 mL at three months and 60 mL at six months.

Four hours following the initiation of DBT, the peak flow rate is 83% of predicted ….” In this case, proper coding for four hours of continuous inhalation treatment would be 94644, 94645 x 3.