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Peak Flow Monitoring

What is peak flow?

Peak flow is the measurement of how effectively air moves out of your lungs . A peak flow meter monitors your asthma the way a blood pressure cuff monitors your blood pressure. Measuring peak flow helps determine any narrowing in your airways before you have an actual attack. This allows you to take your medicine before a serious attack develops.

Why is peak flow monitoring so important?

Peak flow monitoring allows you and your doctor to manage your condition effectively. It gives an accurate picture of your condition that allows your doctor to make appropriate decisions regarding the effectiveness of your medicine plan and treatment plan .

Other benefits of peak flow monitoring include the following:

  • Helps you decide whether your condition is serious enough to seek emergency treatment.
  • Allows you to detect early stages of airway obstruction to start immediate treatment.
  • Gives you an accurate picture of the variations in your condition over a 24- hour period. This permits your doctor to prescribe treatment when you need it the most.
  • Helps you differentiate between airway obstruction and other causes of breathlessness like hyperventilation.
  • Allows you to ascertain specific allergens, irritants, or workplace exposures that may cause your symptoms to develop.
  • Enables you to communicate more effectively with your doctor so that he or she can provide guidance over the phone if needed.
  • May be an effective detector to monitor whether your asthma symptoms have stabilized, improved, or deteriorated/worsened.

How do I start?

Most adults and young children can use a peak flow meter.

All it requires is a short, hard blow of air into the meter. Here's how to use the peak flow meter :

  • Place the indicator at the base of the numbered scale.
  • Sit upright or stand up.
  • Take a deep breath .
  • Place the meter in your mouth and close your lips around the mouthpiece. Be sure not to put your tongue in the hole.
  • Blow out as hard and fast as you can.
  • Write down the number that you get.
  • Repeat the above steps two more times.
  • Write down the highest of the three numbers in your asthma diary.

What is the "Three Zone" system?

You need to find your personal best peak flow number. This is the highest number that you can attain over a 2-week period when you feel good and do not have any asthma symptoms. These measurements should be taken when you wake up and in the evening. They should also be taken before and after taking an inhaled medication , if you use one. Keep an accurate record of these readings so that you can discuss them with your doctor.

Peak flow numbers have been put into zones that are set up like a traffic light. Using your personal best peak flow number, you can determine what zone the reading falls in and respond with the appropriate treatment.

For example:

traffic signal with red, yellow, and green lights

GREEN ZONE (80% to 100% of your personal
best number)

The green zone signals all clear. No asthma symptoms are present and you can take your medications as you have been doing.

YELLOW ZONE (50% to 8O% of your personal best number)

The yellow zone signals caution. You may be having an asthma attack that requires an increase in medication, or your doctor may need to change your treatment plan because your asthma is not under control.

RED ZONE (below 50% of your
personal best number)

The red zone signals a medical alert. You should first take your short-acting bronchodilator immediately and then contact your doctor right away.

Be sure to talk to your doctor regarding peak flow monitoring. Your particular zones should be established based on your individual condition.

How do I keep track of my peak flow readings?

It is important to keep a daily diary of your peak flow readings so that you and your doctor can better evaluate your treatment plan . This information can help you to effectively control your condition and lead a more active, healthy life.

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Very High Tree Pollen Alert Continues for Fifth Straight Day
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Very High Tree Pollen Alert Continues for Fifth Straight Day

VERY HIGH LEVELS of Tree Pollen Detected for 4/3/2026

VERY HIGH RANGE: ALLERGY ALERT. COMBINED TREE POLLEN COUNTS ARE AT VERY HIGH LEVELS on Friday, April 3rd, 2026

TOTAL TREE POLLEN remains in the VERY HIGH RANGE today. This is an extreme exposure situation. Severe symptoms may be expected in tree pollen sensitive individuals. More seriously allergic persons should be advised to stay indoors as much as possible. This is especially true if a person has tree pollen sensitivity or allergic bronchial asthma.

Multiple tree pollens detected today: Oak (VERY HIGH), Mulberry and Sycamore (HIGH); Hackberry, Ash, and Cottonwood (MODERATE); Willow, Cedar, Pine, Privet, Maple, and Sweetgum (LOW).

Spring tree pollen affects thousands of people across the Oklahoma region, triggering allergic rhinitis, commonly known as “hay fever”, as multiple tree species begin pollinating as the weather warms.  These pollen grains can be carried hundreds of miles due to windy conditions.

For More Information -

The best way to combat these allergens is to stay in filtered air. OAAC’s board-certified allergists recommend avoiding allergy triggers as the best way to reduce symptoms. These triggers include:

  • Limit outdoor activities during days with high pollen counts.
  • Keep windows closed (at home or in the car) to keep pollen out.
  • Don’t wear your outdoor work clothes in the house; they may have pollen on them.
  • Take a shower after coming indoors. Otherwise, pollen in your hair may bother you all night.
  • Leave shoes outside or just inside the door so that you don’t track pollen inside your home.
  • Wash your hands often. Pollen can stick to your hands when you touch something outside or a pet if it has been outside.
  • Wear a dust mask that people like carpenters use (found in hardware stores) when you need to do outdoor tasks such as raking leaves.
  • Clean and replace furnace and air conditioner filters often. Using HEPA (high efficiency particulate air) filters is recommended, which remove at least 99 percent of pollen, as well as animal dander, dust, and other particles.

Some other options include medications like nasal sprays and antihistamines, but it needs to be the correct medicine and should be used continuously throughout the season.

Seasonal allergies (allergic rhinitis, commonly known as “hay fever”) cannot be diagnosed by history alone. A board-certified allergist can diagnose allergies and determine the specific triggers that cause them through simple tests. The allergists at OAAC evaluate and manage patients of all ages from the southwest region.  The main clinic is on the Oklahoma University Health Sciences Center campus.  For patient convenience, satellite offices are located in Edmond, Norman, and northwest Oklahoma City.

For more information about allergic rhinitis (“hay fever”), visit: https://oklahomaallergy.com/services/allergic-rhinitis/

Daily Pollen Counts for Weed, Grass and Tree pollen, as well as Mold levels can be found at: https://oklahomaallergy.com/allergy-report/

Visit the OAAC website at www.oklahomaallergy.com to view the addresses for all Oklahoma Allergy and Asthma Clinic locations.  To make an initial appointment for an allergy, asthma, or immunology problem or to request more information, please call (405) 235-0040 or visit the website.

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