76635-2
LOINC Code
| LOINC code | 76635-2 | |
|---|---|---|
| name | ||
| 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] To report a QTc without specifying a method, use LOINC code 8636-3 QT interval corrected. To report QTc calculated using the Fridericia formula, use LOINC code 76634-5. | |
| 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 | Bazett formula | |
Additional Names | ||
| short name | Cardiac; Cardio; Cardiology; EKG; EKG.MEASUREMENTS; Electrocardiogram; Heart Disease; Hrt; Point in time; QNT; Q-T interval corrected; Quan; Quant; Quantitative; Random | |
Basic Attributes | ||
| class | EKG.MEAS | |
| type | 2 Clinical | |
| order vs. observation | Q-T interval co | |
| formula (readable) | QTc (Bazett) = QT interval/square root of the RR interval (in sec) | |
| 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) | |
History/Usage | ||
| first released | ||
| last updated | 2.52 | |
| last change type | MIN - change to field other than name | |
| change reason | s | |
Related Names | ||
Copyright © 2026 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2026, 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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