This test may be performed if your symptoms and spirometry test do not clearly show asthma.

如果你的症状和肺功能测试并不能清楚地表明你患有哮喘，那么你就可以进行这项试验。

During this test, you inhale increasing amounts of methacholine aerosol mist before and after spirometry.

在这个试验中，你要先吸入大量的醋甲胆碱气雾剂，然后再进行肺活量测试。

During this test, you inhale increasing amounts of methacholine aerosol mist before and after spirometry .

在这个试验中，你要先吸入大量的醋甲胆碱气雾剂，然后再进行肺活量测试。

The changes corresponding to fibrosis would attribute to the spirometry results a rather restrictive pattern of changes.

这句话本意是讲肺功能测定这样一个限制性通气模式的变化是因为肺纤维化改变。

Patients with obstruction to air flow on expiration on spirometry that improves by 15% after bronchodilator therapy is further evidence of bronchial asthma that is suggested by clinical history.

临床病史提示有气流阻塞而怀疑支气管哮喘时，用支气管扩张药物后，流量改善超过15% ，可进一步说明支气管哮喘可能性大。