Using z-scores to Interpret Pulmonary Function Test (PFT) Data

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The 2022 European Respiratory Society/American Thoracic Society (ATS/ERS) PFT interpretation standards recommended that z-score be used to grade PFT results. This video will provide a concise definition of z-scores, and guidance on how z-scores are used to determine whether or not a measured PFT value should be categorized as normal or abnormal.

Опубликовано:

11 сен 2024

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Комментарии : 13

@pjsmdpete 10 месяцев назад

Thanks for the outstanding review. I am the medical director of a PFT lab in Baltimore. We are moving to z-scores (rather than percent predicted) in our interpretations for the reasons so elegantly discussed in your video. I am recommending this video to any of our staff that would like to delve more deeply into the basic statistical rationale for using z-scores in interpreting presence and severity of PFT abnormalities.

@jeffreyhaynes2572 10 месяцев назад

Thank you Dr. Sloane, I'm pleased that so many are finding this video useful.

@naghmehradhakrishna4155 Месяц назад

Really great video. I am respiratory physician and I really struggled with understanding this until I came across your video. Cheers.

@jeffreyhaynes2572 Месяц назад

@@naghmehradhakrishna4155 thank you for your kind words

@TheWhateverMan420 Месяц назад

Im a pateint with my PFT results that my doctor never interpreted..damn VA....i am seeing some low %. My FEF 25-75 is 43% prior to albutural and 63% after. This is not great, is it?

@jeffreyhaynes2572 Месяц назад

I'm not your physician so I can't speak to your specific case, but just know that the FEF25-75% has a very wide normal range especially as you get older. This is one of the problems I address in my video, a "low percent of predicted" might actually have a normal z-score (i.e. it is within the normal range).

@TheWhateverMan420 Месяц назад

@@jeffreyhaynes2572thank you! Wish my physician would go over my results with me. Never even been able to meet whoever it is. VA Healthcare has gone downhill

@caileymiller3591 2 месяца назад

Thank you!

@maherahmed1977 4 месяца назад

Thank you, well done!

@lancelothert 7 месяцев назад

Great video Jeff! Curious - When you went over the z-scores for spirometry, the abnormal values for FEV1 showed a z-score of -2.29 (mild), and a z-score for the FEV1/FVC ratio of -3.59 (moderate). Using the new recommendations, would you call this mild airflow obstruction based on the z-score for FEV1?

@jeffreyhaynes2572 7 месяцев назад

Good question, obstruction on spirometry is defined by the FEV1/FVC ratio, so that's how I would quantify the level of obstruction. You can certainly have a normal FEV1 and a low FEV1/FVC, and you wouldn't classify such a spirometry result as normal.