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If a person without Asthma breathes into a Peak Flow Machine, what level would they be at?

(29 Posts)
QuintessentiallyQS Tue 13-May-14 12:33:15

I am just wondering whether my lungs are really bad or not.

TheFutureSupremeRulersMum Tue 13-May-14 12:34:48

I think it depends on your age. I usually get about 450 I think.

PostHocErgoPropterHoc Tue 13-May-14 12:35:56
TheFutureSupremeRulersMum Tue 13-May-14 12:35:59

Graph from Wiki

stargirl1701 Tue 13-May-14 12:37:16

DH used mine last night. He got 690! Mine is an average of 400 when I'm well.

I think men and women differ. Men have larger lung capacity?

thegreylady Tue 13-May-14 12:38:36

I have asthma and 300 is really good for me sad

PostHocErgoPropterHoc Tue 13-May-14 12:40:19

I never get any idea of the number when I do it at the GPs, they just tell me to have another go and give a vague idea of whether it's any good or not.

LtEveDallas Tue 13-May-14 12:40:40

I'm a 41 year old smoker and did 380 last Tuesday. Thats pretty poor judging by the SIOB the nurse did.

QuintessentiallyQS Tue 13-May-14 12:42:04

So PostHocs link is normal values for a person with asthma, and Future Supremes link gives value for people without asthma?

QuintessentiallyQS Tue 13-May-14 12:43:41

So, I do in the region of 350 in the morning before preventer inhaler.
410 in the evening just before bed.

QuintessentiallyQS Tue 13-May-14 12:43:54

I dont smoke.

PostHocErgoPropterHoc Tue 13-May-14 12:44:54

I think mine says normal peak flow values doesn't it? It's just an asthma related website. Did I mess up my snarky LMGTFY?

maras2 Tue 13-May-14 12:44:59

Mine's 600.Non smoker,no asthma,age 60,wind instrument player.

Sadpuppy Tue 13-May-14 12:45:22

Is there a chart like that Wiki one for children?

TheFutureSupremeRulersMum Tue 13-May-14 12:49:43

My flute teacher taught me some exercises that are supposed to increase lung capacity. The only one I can remember is standing next to a wall facing it, put a small piece of paper on the wall and then blow on it to keep it where it is. Also I think swimming is supposed to help with lung capacity.

QuintessentiallyQS Tue 13-May-14 12:50:07

Yeah, possibly, Posthoc! wink

I had been to the same website myself already, and did not make sense of whether the values are normal for an asthmatic or normal for a non-asthmatic. Especially because different charts say different things.

I want to compare my readings to a non asthmatic reading.

I have asthma and hit 450 on a good day.

Df is a 65 year old smoker and usually hits 550 ish because it blows to the end of the scale and bounces back down shock

Pisses me right offangry

Thistledew Tue 13-May-14 13:14:40

My peak flow is around 550. 34 yrs old, fairly fit, asthmatic.

NeverendingPotato Tue 13-May-14 13:18:22

I just went to the docs yesterday as I suspect I have asthma, I blew 350, she said at my age (39) she would expect 550-600 so it suggests there is a problem.

If I have asthma it's been untreated since I was at least 9. ds had all the same things I did which is why I think I have it.

When i was first assessed for asthma, I hit 200. I now hit 300/350 on a good day. I am a smoker but in the process of giving up. I'm not a heavy smoker though, ten a day max, usually less

Em3978 Tue 13-May-14 13:53:52

I'm 35, been asthmatic all my life and I get 550 on a normal day, if it drops below 450 I worry. This often confuses health professionals because I'm not meant to be able to blow that much!

QuintessentiallyQS Tue 13-May-14 14:02:20

So 350 to 420 is really not very good.

Could it be down to fitness levels?

I am always so short of breath when walking up the really steep part of mountains, and feel bad for needing to stop and catch my breath at regular intervals.

Now I am confused, is it asthma which is the problem, or my fitness levels?

kittykarate Tue 13-May-14 14:07:39

Your age/height also affects the expected peak flow. e.g. if your 5ft tall you end up with smaller lungs than someone 6ft tall.

So I tend to blow 390 -> 430 normally, but as I'm 5ft tall and 41 that's pretty much 'normal'.

QuintessentiallyQS Tue 13-May-14 14:14:56

I am 1.73 so 5ft ish, and 42 years old.

Sidge Tue 13-May-14 14:32:04

It depends on your age, sex and height.

A peak flow reading alone cannot diagnose asthma.

Someone with well controlled asthma can have a 'normal' peak flow reading.

Someone without asthma can have a low peak flow reading.

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