Peak Flow

Peak Flow Meters

A peak flow meter is a handheld device that measures how well air moves out of your lungs. During an asthma episode, your airways often narrow. A peak flow meter can measure this narrowing hours, even days, before you have any asthma symptoms.

In fact, a peak flow meter is so sensitive to changes in your airways that it can alert you to breathing issues even better than a doctor can when listening to your lungs with a stethoscope.

By taking your asthma medicine when your peak flow meter indicates changes – before you notice symptoms – you may be able to avoid a serious asthma episode.

Measure your peak flow at least once a day, usually in the morning before you take your asthma medicines. You might have to check it more often if you are having more episodes than usual, or if your reading is below 80 percent of your personal best. Check your Asthma Action Plan. Remember to always use the same peak flow meter.

What Are the Peak Flow Zones?

Once you know your personal best peak flow number, your doctor will give you a range of numbers that tell you what to do. The peak flow numbers are put into a chart with zones that are set up like a traffic light. It is easiest if these target zones are added to your Asthma Action Plan. This will help you know what to do when your peak flow number changes. For example:

  Green Zone (80 to 100 percent of your personal best number) signals all clear. No asthma symptoms are present. Take your daily controller medicines (if prescribed), as usual.

Yellow Zone (50 to 80 percent of your personal best number) signals caution. You should take a quick-relief medicine and check to see if your peak flow returns to the green zone. You may be having an asthma episode that requires an increase in your medicines or the addition of new medicines. Or your overall asthma may not be under control. Your doctor may need to change your Asthma Action Plan. Follow your Asthma Action Plan and seek additional medical care as indicated.

Red Zone (below 50 percent of your personal best number) signals a medical emergency. You must take your quick-relief medicine right away. Call your doctor immediately if your peak flow number does not return to the yellow or green zone and stay in that zone. If you cannot reach your doctor and your peak flow stays in the red zone, go directly to the emergency room. Your Asthma Action Plan should provide clear instructions.

Learn More

What Are Some Important Things to Remember?

  • Write down your peak flow number in your asthma diary every day.
  • A decrease in peak flow of 20 to 30 percent of your personal best may mean the start of an asthma episode.
  • Your Asthma Action Plan may tell you to take your peak flow reading more often and to adjust your medicines.
  • Use only one meter. Be sure to bring it to your asthma check-ups.

A peak flow reading will only be as good as your effort. Numbers can be artificially high with tongue thrusts or spitting. Or they may be artificially low due to not enough effort or poor technique.


If you’re uncertain if you should schedule an appointment with your physician regarding Sleep Apnea, you can start by completing our FREE online sleep assessment to determine if you could be in need of Overnight Pulse Oximetry(OPO) or Home Sleep Test (HST).

Visit Your Physician

If your assessment shows signs of sleep-disordered breathing or another sleep disorder, bring your results with when visiting your personal physician and discuss options of an overnight pulse oximetry test or Home Sleep Test (HST). If they believe you may be in need of it, they will order the test for you.

Test to be Done

Once the test has been ordered by your physician, Call Clinique RespiArt at 4389261886 to take an appointment to do the test.

Review Results with Sleep specialist

The Overnight Pulse Oximetry (OPO)Test report or Home Sleep Test (HST) report will be send directly to your physician for review. Your physician will follow up with you regarding the results and what is the next step to be done. Usually your doctor will assess your test results and your symptoms and decides if you need a treatment for sleep apnea.

Sleep Apnea Treatment Options

  • Positive Airway Pressure Devices
  • Oral Appliances
  • Neuro-stimulation Therapy
  • Positional Therapy
  • Surgery

Most common and most efficient treatment is the Positive Airway Pressure Devices CPAP.

We can provide you with these devices with a follow up your treatment and answering all your questions.

Online Sleep Assessment

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1305 Rue Mazurette Suite # 204, Montréal

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  • Avatar Erin Leonard ★★★★★ a month ago
    I had a good experience at RespiArt with Al. He was nonjudgmental and willing to work around my situation. He is knowledgeable and makes things comfortable. Would highly recommend. :)
    Side note: For people with disabilities or limited
    … More mobility, I do not think there’s an elevator. There are two flights of stairs. Parking around the place can also be tricky.
  • Avatar ovi varga ★★★★ 4 months ago
    i am new at this stuff but the service i got from Mr. Al was very good and professional.
    I would recommend this to other in need for a CPAP machine...they are the only ones i found that would actually make monthly payments to help people
    … More who don't have $2000 + to give in one shot.
    Thank you very much for your services.
  • Avatar Maddalena Rainone ★★★★★ 4 weeks ago
    Incredible from the start.....I was sent to the wrong place by Google maps but found my way soon after..
    ....Almutaz reached me by phone while I was driving and I was so relieved...I didn't want to miss my appointment!!! He waited
    … More for me!!! Then at the office he educated me on sleep apnea cause I had so many questions.....he takes the time to explain!!! He gives great advice!!! Now we will see what the machine reads for me!! Keep you guys posted!!!!
  • Avatar M K ★★★★★ 7 months ago
    I encourage people to take their health seriously and consult with Al over at RespiArt. Not only he provides good advice for sleep apnea but he also cares about the BEST way to get treatment without breaking the bank. I would definitely … More recommend to anyone in need.
  • Avatar Gabrielle Marfoglia ★★★★★ 7 months ago
    I was very happy with my experience with RespiArt for a home sleep apnea testing: I was able to get an appointment very quickly; Almutaz took the time the explain the equipment and sleep apnea to me; the specialist called me 2 days later … More to go over my results. Everything was great :)