vital

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vital

[vi´tal]
pertaining to life; necessary to life.
vital capacity (VC) the greatest volume of gas that, following maximum inhalation, can be expelled during a complete, slow, forced exhalation; equal to inspiratory capacity plus expiratory reserve volume.

Forced vital capacity (FVC) is the greatest volume of air that can be expelled when a person performs a rapid, forced exhalation, which usually takes about five seconds. The greatest volume of air a person can exhale during one, two, three, or more seconds of forced exhalation is called the forced expiratory volume (FEV). A subscript is added to the abbreviation FEV to indicate the phase during which the particular amount or volume of air is exhaled. A volume exhaled during the first second is designated FEV1.0, a volume exhaled during the first two seconds is designated FEV2.0, and so on. The rate at which a specified volume of air is exhaled during a forced exhalation is called forced expiratory flow (FEF). The rate at which air is exhaled from a forced expiratory volume of 200 mL to one of 1200 mL is designated FEF200–1200 (formerly called maximal expiratory flow, MEF); the rate from 25 to 75 per cent of the forced vital capacity is designated FEF25–75% (formerly called maximal midexpiratory flow, MMF).

Laboratory values for vital capacity, forced vital capacity, forced expiratory volume, and forced expiratory flow are usually reported both as absolute values and as statistically derived predicted values based on the age, sex, and height of a patient. The statistical value is reported as a percentage. See also pulmonary function tests.

vi·tal

(vī'tăl),
Relating to life.
[L. vitalis, fr. vita, life]

vital

/vi·tal/ (vi´t'l) necessary to or pertaining to life.

vital

(vīt′l)
a. Of, relating to, or characteristic of life: vital strength.
b. Necessary to the continuation of life; life-sustaining: a vital organ; vital nutrients.
c. Used or done on a living cell or tissue: vital dyes; vital staining.
d. Concerned with or recording data pertinent to lives: vital records.

vi′tal·ness n.

vital

[vī′təl]
Etymology: L, vita, life
pertaining to or contributing to life forces.

vital

adjective Necessary to maintain life. See Vital signs.

vi·tal

(vī'tăl)
Relating to life.
[L. vitalis, fr. vita, life]

vi·tal

(vī'tăl)
Relating to life.
[L. vitalis, fr. vita, life]

vital

pertaining to life; necessary to life.

vital capacity
the greatest volume of gas that, following maximum inspiration, can be expelled during a complete, slow, unforced expiratory maneuver; equal to inspiratory capacity plus expiratory reserve volume. This is a commonly made and practicable measurement in humans but is not so in animals.
vital red
dye injected into the circulation to estimate blood volume by calculating the concentration of the dye in the plasma.
vital signs
the signs of life, namely pulse, respiration and temperature.
vital statistics
that branch of biometry dealing with the data and laws of animal mortality, morbidity, natality and demography.
vital statistic rate
vital statistics presented as a proportion of a population, e.g. fetal deaths as a percentage of total births. Includes case fatality rate, nonreturn rate at 60 days.