Version 2.77

Term Description

Supersaturation of urine correlates with stone type. Measurement of supersaturated urine can be used for the diagnosis and management of patients with renal lithiasis, in patients who have a radiopaque stone, or when stone analysis is not possible. The supersaturation can be used to predict the likely composition. Urine supersaturation changes can also be used to monitor the effectiveness of therapy by confirming that the crystallization potential is been decreased. The differential Gibbs free energy is a measure of the thermodynamic pressure for crystals to form. For this term, a software program, EQUIL PMID: 3840540 was used to calculate the urinary supersaturation for the common kidney stone components expressed as the Gibbs free energy of transfer from a supersaturated to a saturated solution. The delta G (DG) will equal zero for solutions at saturation, will be greater than zero for super-saturated solutions, and less than zero for under-saturated solutions. Positive values above the reference mean are associated with increased risk for that type of crystal formation.
Source: Regenstrief LOINC

Part Descriptions

LP16846-5   Calcium oxalate
Calcium oxalate is a chemical compound that forms needle-shaped crystals. Large quantities are found in the painfully poisonous plant dumb cane. It is also found in rhubarb leaves, various species of Oxalis , and agaves, and (in lower amounts) in spinach. Most kidney stones are caused by calcium oxalate. All Arums typically have unique flowers, consisting of a pike of reduced male or female organs, or both, surrounded by a showy petal-like leaf, a bract, which is often colorful. The toxic parts are the leaves. They contain calcium oxalate, a compound derived from oxalic acid, as well as enzymes which trigger the release of antibodies called histamines in the bloodstream of persons who ingest the leaves. Oxalates are needle-like crystals, which, when eaten, may pierce the mouth, throat and digestive tract as they pass through, causing, at the very least, intense discomfort. Nonsoluble calcium oxalate crystals are found in plant stems, roots, and leaves. Copyright Text is available under the Creative Commons Attribution/Share-Alike License. See for details. Source: Wikipedia, Calcium oxalate (Wikipedia)

LP16846-5   Calcium oxalate
The calcium salt of oxalic acid, occurring in the urine as crystals and in certain calculi. Source: National Library of Medicine, MeSH 2006

LP16846-5   Calcium oxalate
Calcium oxalate (Ca[COO]2) crystals are the most frequently observed crystals in urine, and 75% of renal calculi have calcium oxalate as a component. Calcium oxalate crystals can form at any pH and have various microscopic morphologies. It is estimated that about half of the oxalate in urine comes from ascorbic acid (vitamin C), which is a precursor to oxalate. Calcium oxalate crystals are also associated with ethylene glycol ingestion, another oxalate precursor. Source: Regenstrief LOINC, Wikipedia: Calcium oxalate

Fully-Specified Name

Calcium oxalate

Additional Names

Short Name
CaOx 24h EngDiff Ur
Display Name
Calcium oxalate (24H U) [Energy diff]
Consumer Name Alpha Get Info
Calcium oxalate, Urine

Basic Attributes

First Released
Version 2.56
Last Updated
Version 2.56
Order vs. Observation

Member of these Panels

LOINC Long Common Name
81232-1 Supersaturation panel - 24 hour Urine

Language Variants Get Info

Tag Language Translation
es-ES Spanish (Spain) Oxalato cálcico:Diferencia de energía:24 horas:Orina:Qn:
Synonyms: Cuantitativo
es-MX Spanish (Mexico) Oxalato de calcio:Diferencia energética:24H:Orina:Cuantitativo:
fr-FR French (France) Calcium oxalate:Energie(différence):24H:Urine:Numérique:
it-IT Italian (Italy) Ossalato di calcio:Differenza di energia:24h:Urine:Qn:
Synonyms: 24 Ore Chimica
pl-PL Polish (Poland) Szczawian wapnia:różnica energii:24 godziny:mocz:ilościowy:
zh-CN Chinese (China) 草酸钙:能量差:24小时:尿液:定量型:
Synonyms: 1天;1日;24.0小时;一天;一日;二十四个小时;二十四小时 CA;Cal CaC2O4;CaOx Oxal;乙二酸;乙二酸根;乙二酸盐;乙二酸酯;草酸根;草酸盐;草酸酯 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 尿;小便;下泉 能量(差值、差异、差别、差额、区别);能量差值;能量差;能差

Example Units

Unit Source
kJ/mol Example UCUM Units

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

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