Version 2.78

Term Description

Stool osmotic gap is calculated to evaluate the cause of chronic diarrhea. It is the difference between measured and calculated stool osmolality. A low stool osmotic gap can imply secretory diarrhea due to various causes, including cholera, vasoactive intestinal peptide, laxative abuse, and gastrinoma. A high gap can imply osmotic diarrhea possibly due to chronic pancreatitis, lactase deficiency or Whipple's disease.
Source: Regenstrief LOINC

Part Description

LP172681-1   Osmol gap
While it is possible to convert between osmolality and osmolarity, thereby deriving a more mathematically correct osmol gap calculation, in actual clinical practice this is not done. This is because the difference in absolute value of these two measurements that can be attributed to the difference in units will be negligible in a clinical setting. For this reason, the terms are often used interchangeably, though some object to equating the terms. Because the calculated osmol gap can therefore be a conflation of both terms (depending on how it is derived), neither term (osmolal gap nor osmolar gap) may be semantically correct. To avoid ambiguity, the terms "osmolal" and "osmolar" can be used when the units of molality or molarity are consistent throughout the calculation. When this is not the case, the term "osmol gap" can be used when units are mixed to provide a clinical estimate. Copyright Text is available under the Creative Commons Attribution/Share-Alike License. See http://creativecommons.org/licenses/by-sa/3.0/ for details. Source: Wikipedia, Osmol gap

Fully-Specified Name

Component
Osmol gap
Property
Osmol
Time
Pt
System
Stool
Scale
Qn
Method

Additional Names

Short Name
Osmol gap Stl
Display Name
Osmol gap (Stl) [Osmolality]
Consumer Name Alpha Get Info
Osmol gap, Stool

Basic Attributes

Class
CHEM
Type
Laboratory
First Released
Version 2.44
Last Updated
Version 2.73
Order vs. Observation
Both
Common Test Rank Get Info
19348

Formula (Readable)

Osmotic gap = Measured osmolality - 2x (fecal Na+ + Fecal K+)

Member of these Panels

LOINC Long Common Name
88697-8 Electrolytes and Osmolality panel - Stool

Language Variants Get Info

Tag Language Translation
es-ES Spanish (Spain) Hueco osmótico:Osmolalidad:Punto temporal:Heces:Qn:
Synonyms: Cuantitativo
es-MX Spanish (Mexico) Brecha de Osmol:Osmolalidad:Punto temporal:Heces:Cuantitativo:
fr-CA French (Canada) Trou osmolaire:Osmolalité:Temps ponctuel:Selles:Quantitatif:
fr-FR French (France) Trou osmolaire:Osmoles:Ponctuel:Selle:Numérique:
fr-BE French (Belgium) Trou osmolaire:Osmolalité:Temps ponctuel:Selles:Quantitatif:
it-IT Italian (Italy) Osmol, gap:Osmol:Pt:Feci:Qn:
Synonyms: Chimica Osmolalità Punto nel tempo (episodio)
nl-NL Dutch (Netherlands) osmotische gap:osmolaliteit:moment:feces:kwantitatief:
Synonyms: ontlasting; feces
pt-BR Portuguese (Brazil) Gap osmolar::Pt:Fezes:Qn:
ru-RU Russian (Russian Federation) Осмоль интервал:Осмол:ТчкВрм:Фекалии:Колич:
Synonyms: Количественный Осмоль промежуток Осмоляльность Точка во времени;Момент
tr-TR Turkish (Turkey) Ozmol açığı:Ozmol:Zmlı:Dışkı:Kant:
Synonyms: Gaita; feçes
uk-UA Ukrainian (Ukraine) Осмоляльності розрив:Осмоляльність:МоментЧасу:Кал:Кількісно:
Synonyms: Bowel movement; Chemistry; Faecal; Faeces; Fecal; Feces; Osmo; Osmolality; osmolarity; Point in time; QNT; Quan; Quant; Quantitative; Random; Stl; Stool = Fecal
zh-CN Chinese (China) 摩渗间隙:渗透压:时间点:大便:定量型:
Synonyms: MO;单位质量溶剂之中溶质的渗透摩尔数;Osm/Kg;measured osmolality;渗透浓度;渗透度;溶质度;重量克分子渗透压浓度;同渗重摩;Osmo;Osmol;克分子渗透压浓度;摩尔渗透压浓度 OG;渗透压间隙;同渗重摩间隙;摩尔渗透压浓度间隙;渗透度间隙;溶质度间隙;重量克分子渗透压浓度间隙;同渗重摩差值;同渗重摩差;渗透莫耳浓度差;渗透摩尔浓度差 便;大肠运动;排便;粪便;肠运动 化学;化学检验项目;化学检验项目类;化学类;化学试验;非刺激耐受型化学检验项目;非刺激耐受型化学检验项目类;非刺激耐受型化学试验;非刺激耐受型化学试验类 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 时刻;随机;随意;瞬间

Example Units

Unit Source
mosm/kg 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=73571-2