8636-3
ClinicalQ-T interval corrected
Definition
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.
LOINC 6-Axis Classification
Component
QTC interval
Property
Time
Time Aspect
Pt
System
Heart
Scale Type
Qn
Method Type
N/A
Details
Class
EKG.MEAS
Order/Observation
Observation
Short Name
Q-T interval corrected
Related Names
Frequently Asked Questions
What is LOINC code 8636-3?
LOINC code 8636-3 identifies "Q-T interval corrected". 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.
What does 8636-3 measure?
This code measures QTC interval in Heart. It belongs to the EKG.MEAS class in the LOINC classification.
What is LOINC?
LOINC (Logical Observation Identifiers Names and Codes) is a universal standard for identifying laboratory and clinical observations. It is maintained by the Regenstrief Institute and used worldwide for health data exchange.