Rivers Double Sample

The Rivers double test is a method for assessing external respiratory function. It is used to detect obstructive and restrictive pulmonary function disorders.

When performing this test, the patient first inhales maximally and then exhales maximally. After this, the patient exhales as deeply as possible, and then exhales as deeply as possible again. Air volumes are measured with each exhalation.

With normal lung function, the difference between the first and second exhalation does not exceed 10% of the volume of the first exhalation. If the difference is greater, it indicates airway obstruction.

The Rivers test is used to diagnose and monitor diseases such as asthma, chronic bronchitis and emphysema. It is easy to perform and provides important information about the state of respiratory function.