"What's Your Personal Best on Your Peak Flow? Hmmm?"
"What's your personal best on your peak flow? Hmmm?" This was the start of a conversation I overheard between my older son and my daughter. Of course my daughter had to roll her eyes. I can interpret that eye roll to mean "stop talking and go away."
I have a family of 5, all 5 of us have allergies, and 4 of us have asthma. For the last 20 years, our life and conversations have revolved around allergies and asthma. Sad, but true.
So what were my kids talking about? What is a peak flow, and what does it have to do with asthma?
A peak flow meter is a small handheld device that measures how much air you can blow out in 1 second. For it to work well, you have to blow hard and fast! If used right, a peak flow meter is a good tool to use to see how your lungs are doing.1
How peak flow works:1
- Green zone is between 80-100%
- Yellow zone is between 50% and 80%
- Red zone is less than 50%
As an example, if your personal best is 500, your green zone would be between 400 - 500. That's your "normal range." Your yellow zone would be between 250 - 400. And your red zone would be anything less than 250.
Personal bests will vary
Why? Well, size matters - as does your gender. A child will have a lower reading than an adult (because kids naturally have smaller lungs.) Additionally, men typically have bigger lungs than women.1 Who knew?! This can be a random trivia point you can use to astonish and amaze people. Ha!
Using a peak flow meter (we just call it a peak flow), can help you monitor your lungs. For our family, our peak flows were literally lifesavers. With 12 hospitalizations for my kids, the peak flow would give me advanced warning that my kids were getting sick and their airways were swelling. Their peak flow would start to drop, and then two days later, the running nose and coughing would start. I knew that meant we were in for a rough couple of weeks. I would call the asthma doctor, and he would adjust my kid's medications, listen to their lungs, and see if they needed to be admitted to the hospital.
We regularly test peak flows
My kids' asthma had a habit of going from bad to worse very quickly, so peak flows were mandatory at our house every morning and night. Each kid would blow into their peak flow and yell out their number. I knew each of my kids' numbers, and I could HEAR how their lungs were doing by listening to them exhale hard and fast.
My middle son had the most severe asthma, and would yell out his number. When he was little, he would yell "350!" each morning before he had breakfast. Some days, I could tell he was a little off, and he would yell "275!" I could hear that his lungs sounded weaker. In fact, his voice would also sound higher and tighter. He would try his peak flow again, but couldn't get past 275.
So, was he faking it so he didn't have to go to school? Peak flows are "effort dependent," meaning you have to use it right. Some kids can try to fool their parents and doctors by blowing softer than normal. My kids never did that. They missed so much school being sick at home, or in the hospital, that they WANTED to be normal and go to school with their friends. They hated missing school!
Talk to your doctor
If you don't have a peak flow meter for your asthma, talk to your doctor about getting one. There are many different types and prices, so find what you like.
As for my kid's conversation: of course, my older son had a much higher peak flow than his sister because he's bigger and he's male. And he because he plays the bagpipes!
How often do you use a peak flow meter?
Have you ever gotten "moon face" as a side effect of prednisone?