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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.

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

LOINC Names Get Info

Fully-Specified Name
Osmol gap:Osmol:Pt:Stool:Qn:
Long Common Name
Osmol gap of Stool
Short Name
Osmol gap Stl
Display Name
Osmol gap (Stl) [Osmolality]
Consumer Name Alpha Get Info
Osmol gap, Stool

Part Model Get Info

  • Component
    Osmol gap
    LP172681-1
    • Analyte
      Osmol gap
      LP172681-1
      • Component Numerator
        Osmol gap
        LP172681-1
        • Component Numerator Core
          Osmol gap
          LP172681-1
        • Component Numerator Core Suffix
          NULL
           
      • Component Denominator
        NULL
         
        • Component Denominator Core
          NULL
           
        • Component Denominator Core Suffix
          NULL
           
    • Challenge
      NULL
       
    • Adjustment
      NULL
       
    • Count
      NULL
       
  • Property
    Osmol
    LP6843-9
  • Time
    Pt
    LP6960-1
  • System
    Stool
    LP7604-4
    • System Core
      Stool
      LP7604-4
    • Super System
      NULL
       
  • Scale
    Qn
    LP7753-9
  • Method
    NULL
     

Basic Attributes

Class
CHEM
Type
Laboratory
First Released
Version 2.44
Last Updated
Version 2.73 (MIN)
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

LOINCLong Common Name
88697-8Electrolytes and Osmolality panel - Stool

Language Variants Get Info

TagLanguageTranslation
cs-CZCzech (Czechia)Osmolální okno:Osmolalita:Časový bod:Stolice:Kvantitativní:
el-GRGreek (Greece)Οσμωτικό χάσμα:Osmol:Pt:Κόπρανα:Qn:
Synonyms: CHEM Osmol Pt Qn Κόπρανα Οσμωτικό χάσμα
es-ESSpanish (Spain)Hueco osmótico:Osmolalidad:Punto temporal:Heces:Qn:
Synonyms: Cuantitativo
es-MXSpanish (Mexico)Brecha de Osmol:Osmolalidad:Punto temporal:Heces:Cuantitativo:
fr-CAFrench (Canada)Trou osmolaire:Osmolalité:Temps ponctuel:Selles:Quantitatif:
fr-FRFrench (France)Trou osmolaire:Osmoles:Ponctuel:Selle:Numérique:
fr-BEFrench (Belgium)Trou osmolaire:Osmolalité:Temps ponctuel:Selles:Quantitatif:
it-ITItalian (Italy)Osmol, gap:Osmol:Pt:Feci:Qn:
Synonyms: Chimica Osmolalità Punto nel tempo (episodio)
nl-NLDutch (Netherlands)osmotische gap:osmolaliteit:moment:feces:kwantitatief:
Synonyms: ontlasting; feces
pl-PLPolish (Poland)Luka osmolalna:osmolalność:punkt w czasie:kał:ilościowy:
Synonyms: Luka osmotyczna
ru-RURussian (Russian Federation)Осмоль интервал:Осмол:ТчкВрм:Фекалии:Колич:
Synonyms: Количественный Осмоль промежуток Осмоляльность Точка во времени;Момент
tr-TRTurkish (Turkey)Ozmol açığı:Ozmol:Zmlı:Dışkı:Kant:
Synonyms: Gaita; feçes
uk-UAUkrainian (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-CNChinese (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

UnitSource
mosm/kgExample 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