Horowitz index
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| Horowitz index | |
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| LOINC | 50982-8, 50984-4, 50983-6, 50985-1, 50986-9 |
The Horowitz index (synonyms: oxygenation after Horowitz, Horowitz quotient) is a ratio used to assess lung function in patients, particularly those on ventilators. It is useful for evaluating the extent of damage to the lungs. The simple abbreviation as oxygenation can lead to confusion with other conceptualizations of oxygenation index.
The Horowitz index is defined as the ratio of partial pressure of oxygen in blood (PaO2), in millimeters of mercury, and the fraction of oxygen in the inhaled air (FIO2).
In healthy lungs is the Horowitz index depends on age and usually falls between 350 and 450. A value below 300 is indicative of a [[acute lung injury|moderately severe lung injury]. A value below 200 as a criterion for a severe injury.
See also
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