Q-T interval corrected 8636-3
LOINC Code
| LOINC code | 8636-3 | ||||
|---|---|---|---|---|---|
| name | Q-T interval corrected | ||||
| description | The purpose of calculating a corrected QT interval (QTc) is to normalize each individual QT measurement from a given study to a single measurement that would represent the QT interval if the patient had a heart rate of 60 beats per minute. Several formulas are available to calculate QTc, including the Bazett formula and the Fridericia formula. Bazett's formula is used most commonly, but for situations in which the patient's heart rate is significantly elevated, the Fridericia formula may yield a more accurate QTc that reflects the QTc that would have been obtained were the patient in normal sinus rhythm. [PMID: 23972343] Use this LOINC code to report a QTc without specifying a method. For QTc by Fridericia use 76634-5, and for QTc by Bazett use 76635-2. | ||||
| status | ACTIVE | ||||
Fully-Specified Name | |||||
| component | QTC interval | ||||
| property | Time = Time Duration | ||||
| time | Pt = Point in time: To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements. | ||||
| system | Heart | ||||
| 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 | Q-T interval corrected | ||||
Basic Attributes | |||||
| class | EKG.MEAS | ||||
| type | 2 Clinical | ||||
| order vs. observation | Observation | ||||
| example UCUM units | s 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 | s | ||||
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 | |||||
| test rank | 1454 of 2000 most commonly performed tests by labs in USA | ||||
| first released | |||||
| last updated | 2.73 | ||||
| last change type | MIN - change to field other than name | ||||
Related Names | |||||
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Copyright © 2023 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2023, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. See https://loinc.org/license for the full LOINC copyright and license.
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