Horowitz index

noun

An assessment of lung function; the ratio of partial pressure of oxygen in blood (PaO2), and the fraction of oxygen in the inhaled air (FiO2).

Similar
HorowitzHorowitz ratioHorowitz quotientHorowitz numberP/F ratioPaO2/FiO2 ratioCarrico index
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Meanings

nounHorowitz index (plural Horowitz indexes or Horowitz indices)

plural Horowitz indexes · plural Horowitz indices

  1. medicineAn assessment of lung function; the ratio of partial pressure of oxygen in blood (PaO2), and the fraction of oxygen in the inhaled air (FiO2).

    Synonyms: Horowitz, Horowitz ratio, Horowitz quotient, Horowitz number, P/F ratio, PaO2/FiO2 ratio, Carrico index

Synonyms & antonyms

nounAn assessment of lung function; the ratio of partial pressure of oxygen in blood (PaO2), and the fraction of oxygen in the inhaled air (FiO2).

Similar
HorowitzHorowitz ratioHorowitz quotientHorowitz numberP/F ratioPaO2/FiO2 ratioCarrico index
Also see
carrico indexhorowitz numberhorowitz quotienthorowitz ratiopao2/fio2 ratio

Origin

The ratio was first suggested in a 1974 paper by Joel H. Horovitz et al. The reason for the spelling with w is unclear.

Full word history & related roots →
Cite this entry
APA

Horowitz index. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/Horowitz%20index

MLA

“Horowitz index.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/Horowitz%20index. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “Horowitz index,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/Horowitz%20index.

Source: Horowitz index on Wiktionary, CC BY-SA 4.0.