Q-T interval corrected based on Fridericia formula   76634-5

LOINC Code


LOINC code76634-5
nameQ-T interval corrected based on Fridericia formula
descriptionThe 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 Bazett formula, use LOINC code 76635-2.
statusACTIVE

Fully-Specified Name

componentQTc interval
propertyTime  =  Time Duration
timePt  =  Point in time:  To identify measures at a point in time. This is a synonym for “spot” or “random” as applied to urine measurements.
systemHeart
scaleQn  =  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
methodFridericia formula

Additional Names

short nameQ-T interval corrected Fridericia

Basic Attributes

classEKG.MEAS
type2  Clinical
order vs. observationBoth
formula (readable)QTc (Fridericia) = QT interval/cube root of the RR interval (in sec)
example UCUM unitss
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 units

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.

History/Usage

first released
last updated2.52
last change typeMIN  - change to field other than name

Related Names

Cardiac
Cardio
Cardiology
EKG
EKG.MEASUREMENTS
Electrocardiogram
Heart Disease
Hrt
Point in time
QNT
Q-T interval corrected
Quan
Quant
Quantitative
Random

Copyright © 2024 Regenstrief Institute, Inc. All Rights Reserved. To the extent included herein, the LOINC table and LOINC codes are copyright © 1995-2024, 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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