<s>[INST] Can the peak flow meter tell me if I need to see the doctor? [/INST] If you take peak flow readings regularly or know the reading you get when your asthma is well controlled then, as a general rule, if the reading falls to less than two-thirds of the usual level, it is time to be cautious and to increase the amount of medication. A reading that is less than half the usual level often indicates the need for immediate help, but this varies from person to person.It is best if you and your doctor together set a personal peak flow reading that indicates when it is time for you to increase the dose of medication or seek acute help. This should be combined with a written treatment plan for your medications.It is important to realize that your treatment should not be entirely determined by your peak flow readings. Whenever the usual treatment does not have the effect you wish on the control of your asthma you should discuss this with your doctor, regardless of the peak flow reading. Source: Ginasthma. Link: https://ginasthma.org/about-us/faqs/. Field: Lung Disease. Disease: Asthma </s>