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 Description

LP208508-4   Hydroxyapatite
Hydroxylapatite, also called hydroxyapatite (HA), is a naturally occurring mineral form of calcium apatite with the formula Ca5(PO4)3(OH). HA crystal deposition disease (HADD) is a systemic disease of unknown etiology associated with para-articular and or intra-articular deposition of HA crystals. HADD is clinically manifested by localized pain, swelling, and tenderness about the affected joint along with variable limitation of joint motion. When intra-articular, HA crystals can cause joint destruction. Any joint can be involved; the shoulder is most commonly affected, resulting in "Milwaukee shoulder." Treatment includes analgesics, local heat, needling with or without aspiration of the calcific deposits, steroid injections, and possibly surgery for relief of pain. PMID: 14593560 Source: Regenstrief LOINC, PMID: 14593560

Fully-Specified Name


Additional Names

Short Name
Hydroxyapatite 24h EngDiff Ur
Display Name
Hydroxyapatite (24H U) [Energy diff]
Consumer Name Alpha Get Info
Hydroxyapatite, 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) Hidroxiapatita:Diferencia de energía:24 horas:Orina:Qn:
Synonyms: Cuantitativo
es-MX Spanish (Mexico) Hidroxiapatita:Diferencia energética:24H:Orina:Cuantitativo:
fr-FR French (France) Hydroxyapatite:Energie(différence):24H:Urine:Numérique:
it-IT Italian (Italy) Idrossiapatite:Differenza di energia:24h:Urine:Qn:
Synonyms: 24 Ore Chimica
zh-CN Chinese (China) 羟基磷灰石: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 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 羟磷灰石;氢氧磷灰石;氢氧基磷灰石;羟基灰石 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

CodeSystem lookup$lookup?system=