50982-8

LOINC 2.82

Horowitz index in Blood

Horowitz index Bld+IhG-Rto

Definition

  • A ratio with numerator = oxygen partial pressure (PaO2) in mmHg and denominator = fraction of inspired oxygen (FIO2) with no units. If the patient is breathing room air (20% O2) the fraction would be 0.20. It is reported in mmHg. It is a well established marker for lung function during mechanical ventilation and used in many acuity scores like SAPS II, SAPS III, and SOFA.

Component

  • Horowitz index

Specimen / system

  • Bld+Inhl gas

Class

  • CHEM

Property

  • Ratio

Scale

  • Qn

Related names

  • Bld+IhG; Blood; Chemistry; Gases; IhG; Inhaled Gas; Inspired; PaO2/FiO2; Point in time; QNT; Quan; Quant; Quantitative; Random; Ratios; Rto; WB; Whole blood

Index terms

  • Bld+IhG
  • Blood
  • Chemistry
  • Gases
  • IhG
  • Inhaled Gas
  • Inspired
  • PaO2/FiO2
  • Point in time
  • QNT
  • Quan
  • Quant
  • Quantitative
  • Random
  • Ratios
  • Rto
  • WB
  • Whole blood