肺活量計檢查是否會造成肺結核的交互感染，過去只有單一研究以結核皮膚試驗做十週的追蹤，證據不足。我們以疾病管制局查詢系統回溯追蹤與確診前的肺結核病患同一時間使用同一肺活量計的十一名患者，三年後皆無被通報為肺結核者。此一結果支持現行肺活量計作業方式輔以事前的胸部X光篩檢，於肺結核傳染是相對安全性。

The cross-infection of tuberculosis of spirometry is always concerned. There were only few evidences to support the safety. Previous study followed the patients, who used the contaminated spirometry, for ten weeks with skin tests. However, the incubation period of tuberculosis is long. We reviewed the patients, who used the contaminated spirometry incidentally, in four years. The cyber system of public health makes it possible to do the long-term follow-up. There were two index cases and eleven patients used the contaminated spirometer. However, there was no recruited patient infected. This study supports the theory that the risk for the cross-infection via the spirometry is low. However, the potential is still and effort to prevent the contamination of the spirometry and frequent disinfection of apparatus could not be overemphasized.