Version 2.77

Part Description

LP101939-9   Physiological dead space
The physiological dead space is the volume of gas in the respiratory system that is not involved in respiratory gas exchange. It includes both alveolar and anatomical dead space. Alveolar dead space is the volume of alveoli that are ventilated but not perfused (or underperfused), and anatomical dead space is the volume of the respiratory system from the nose and mouth to the level of the distal airways at which gas exchange begins to take place.

Physiological dead space can be calculated using Bohr's equation:
Vd/Vt = (PaCO2−PeCO2)/PaCO2.
Vd is the dead space volume
Vt is tidal volume
PaCO2 is arterial partial pressure of CO2
PeCO2 is the partial pressure of CO2 in expired gas Source: Regenstrief LOINC

Fully-Specified Name

Component
Physiological dead space
Property
Vol
Time
Pt
System
Respiratory system
Scale
Qn
Method

Additional Names

Short Name
Phys dead space Vol Respiratory

Basic Attributes

Class
PULM
Type
Clinical
First Released
Version 2.54
Last Updated
Version 2.54
Order vs. Observation
Both

Formula (Readable)

Vd=[(PaCO2−PeCO2)/PaCO2]*Vt; Vd=dead space volume, Vt=tidal volume, PaCO2=arterial partial pressure of CO2, PeCO2=partial pressure of CO2 in expired gas

Member of these Panels

LOINC Long Common Name
75885-4 IEEE 11073 Rosetta panel

Language Variants Get Info

Tag Language Translation
es-MX Spanish (Mexico) Espacio muerto fisiológico:Volumen:Punto temporal:Sistema respiratorio:Cuantitativo:
it-IT Italian (Italy) Spazio morto fisiologico:Vol:Pt:Apparato respiratorio:Qn:
Synonyms: Gestione ventilazione polmonare Punto nel tempo (episodio) Volume
ru-RU Russian (Russian Federation) Физиологическое мёртвое пространство:Об:ТчкВрм:Дыхательная система:Колич:
Synonyms: Количественный Объем Точка во времени;Момент
zh-CN Chinese (China) 生理死腔:体积型属性:时间点:呼吸系统:定量型:
Synonyms: 体积;容积;容量 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 呼吸道标本（样品、样本）;呼吸系统标本（样品、样本） 时刻;随机;随意;瞬间 生理性死腔;生理性无效腔;生理无效腔;生理学死腔 肺部测量指标与呼吸机管理

Example Units

Unit Source
mL Example UCUM Units

LOINC Terminology Service (API) using HL7® FHIR® Get Info

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=76001-7