Abnormal stress test results may suggest an underlying heart condition, such as coronary artery disease, or a blockage in the arteries supplying blood to the heart. Failing a stress test means you can ...

Forced expiratory volume in 1 second (FEV1) measures how much air you can forcefully exhale in one second. A low FEV1 suggests a breathing obstruction caused by conditions like chronic obstructive ...

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