Hydroxyapatite [Energy Difference] in 24 hour Urine 81622-3
LOINC Code
| LOINC code | 81622-3 | ||
|---|---|---|---|
| name | Hydroxyapatite [Energy Difference] in 24 hour Urine | ||
| 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. | ||
| status | ACTIVE | ||
Fully-Specified Name | |||
| component | Hydroxyapatite | ||
| property | EngDiff = Energy Difference | ||
| time | 24H = 24 hours | ||
| system | Urine | ||
| scale | Qn = Quantitative: The result of the test is a numeric value that relates to a continuous numeric scale. Reported either as an integer, a ratio, a real number, or a range. The test result value may optionally contain a relational operator from the set {<=, <, >, >=}. Valid values for a quantitative test are of the form "7", "-7", "7.4", "-7.4", "7.8912", "0.125", "<10", "<10.15", ">12000", 1-10, 1:256 | ||
| method | |||
Additional Names | |||
| short name | Hydroxyapatite 24h EngDiff Ur | ||
Basic Attributes | |||
| class | CHEM | ||
| type | 1 Laboratory | ||
| order vs. observation | Both | ||
| example UCUM units | kJ/mol The Unified Code for Units of Measure (UCUM) is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business (www.unitsofmeasure.org) | ||
| example unit | kJ/mol | ||
Associated Observations | |||
LOINC codes that represent optional associated observation(s) for a clinical observation or laboratory test. A LOINC term may represent a single associated observation or panel containing several associated observations. | |||
Member of these Panels | |||
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History/Usage | |||
| first released | |||
| last updated | 2.56 | ||
| last change type | ADD - added | ||
Related Names | |||
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