- At least one of the following test suggestive for asthma, performed at any time during the outpatient course: 1) FEV1-reversibility of at least 12% and 200 ml after administration of bronkodilator or Prednisolon course, 2) positive bronkialprovocation test, such as mannitol, or 3) peakflow (PF)-variation of at least 20% assessed during a 14-day period, measured twice daily and at asthmatic symptoms.