CBI calculation in lung function

[Hollyhockhattie]

Please could it be explained what the CBI number at the bottom of the page below your lung function results is. I don’t understand which is the poorer score in comparison to the not so poor score . Higher / lower .

Thank you in anticipation

Holly .

[hypercat54]

Hi I haven't a clue what CBI is but the most important figure is your FEV1 (lung function). x

[jackdup]

I can't recall seeing CBI on a lung function test but generally for any results shown there is a column showing the predicted or expected value for someone your age, height, and gender as well as a column showing your actual results and then a percentage of your results in comparison to the predicted value. Can you post the predicted value and your results and perhaps it will indicate what that number is.

[Hollyhockhattie]

Hi and thanks for the replies . The CBI is not part of the lung function work it’s a from what I have found online to be a mortality calculation based on your results . Computer generated .

Also from what I am reading if the CBI reads 40> then there is a 50% chance of a 5 year survival rate .

5 weeks ago mine was 40 .

This week it’s 36 .

I’ve followed all the advice etc . My saturations have improved. My oxygen levels are slightly higher than my CO2 levels so why this drop . I don’t think that I’m understanding correctly.

Regards

Holly

[jackdup in reply to Hollyhockhattie]

Is this based solely on the results of your lung function test or are there other things factored in as well?