TV-  The tidal volume is the total amount of air inhaled or exhaled during regular  respiration  or relaxed breathing. Approximately 500 ml of air is utilized during normal respiration in a healthy man. IRV-  An inspiratory reserve volume is a supplementary volume, approximately ranging between 2500 to 3100 ml of air which could be effectively inhaled after the inspiration of a standard tidal volume. ERV-  An expiratory reserve volume refers to the additional capacity of air which is about 1200 ml are that could be forcibly exhaled out after the expiration of a standard tidal volume. RV-  The residual volume is about the total volume of air around 1100 ml to 1200 ml residing in the lungs after the reserve volume is emitted or breathed out. By adding up specific lung volumes we can find the values of lung capacities. TLC-  The total lung capacity applies to the total volume of air-filled in the lungs after a forced inspiration. The lung capacity of a healthy man is estimat

Abbreviation Meaning / Intended Meaning 1/2NS one-half normal saline (0.45%) 5-ASA 5-aminosalicylic acid a before A.M. morning aa of each AAA abdominal aortic aneurysm (called a "triple-A") AAA apply to affected area ac before meals achs before meals and at bedtime AD right ear ad lib freely; as much as desired ad sat. to saturation ad. to; up to ALT alanine aminotransferase alt. alternate alt. h. every other hour am, A.M. in the morning; before noon amp ampule amt. amount ant. anterior ante before ap before dinner APAP