xeniar - how long have you been using your peak flow meter? When I first started recording mine, they were all over the place. Mine peak flows are always lower at night by almost 50L/min. This isn't something you can really improve on your own, except to follow the plan your doctor gave you. Does your doctor know you are constantly in the yellow area? I assume so, since he/she is asking you to track it. How long have you had asthma? You should always check with your doctor if you have any questions.
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