An instrument that quantifies the volume of air breathed in and out, as well as the speed of air inhalation and exhalation, is called what?

The instrument that quantifies the volume of air breathed in and out, as well as the speed of air inhalation and exhalation, is indeed a spirometer. A spirometer is specifically designed to measure lung function, providing important information about how well the lungs are working. It calculates various parameters, including forced vital capacity (FVC) and forced expiratory volume in one second (FEV1), which are essential for diagnosing and monitoring respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other pulmonary disorders.

While other instruments like an oximeter, peak flow meter, and gas analyzer serve important roles in respiratory and pulmonary assessments, they do not measure both volume and speed of airflow in the same comprehensive manner as a spirometer. An oximeter measures blood oxygen saturation, a peak flow meter primarily assesses the peak expiratory flow rate, and a gas analyzer evaluates the composition of gases in the breath or blood. Therefore, the spirometer is the correct choice for assessing aspects related to the volume and speed of air flow in and out of the lungs.