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Term 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 Bazett formula, use LOINC code 76635-2.

LOINC Names Get Info

Fully-Specified Name
QTc interval:Time:Pt:Heart:Qn:Fridericia formula
Long Common Name
Q-T interval corrected based on Fridericia formula
Short Name
Q-T interval corrected Fridericia

Part Model Get Info

  • Component
    QTC interval
    LP31071-1
    • Analyte
      QTC interval
      LP31071-1
      • Component Numerator
        QTC interval
        LP31071-1
        • Component Numerator Core
          QTC interval
          LP31071-1
        • Component Numerator Core Suffix
          NULL
           
      • Component Denominator
        NULL
         
        • Component Denominator Core
          NULL
           
        • Component Denominator Core Suffix
          NULL
           
    • Challenge
      NULL
       
    • Adjustment
      NULL
       
    • Count
      NULL
       
  • Property
    Time
    LP6879-3
  • Time
    Pt
    LP6960-1
  • System
    Heart
    LP7289-4
    • System Core
      Heart
      LP7289-4
    • Super System
      NULL
       
  • Scale
    Qn
    LP7753-9
  • Method
    Fridericia formula
    LP189354-6

Basic Attributes

Class
EKG.MEAS
Type
Clinical
First Released
Version 2.52
Last Updated
Version 2.52 (MIN)
Order vs. Observation
Both

Formula (Readable)

QTc (Fridericia) = QT interval/cube root of the RR interval (in sec)

Language Variants Get Info

TagLanguageTranslation
el-GRGreek (Greece)Διάστημα QTC:Time:Pt:Καρδιά:Qn:Τύπος Fridericia
Synonyms: EKG.MEAS Pt Qn Time Διάστημα QTC Καρδιά Τύπος Fridericia
es-MXSpanish (Mexico)Intervalo QTC:Tiempo:Punto temporal:Corazón:Cuantitativo:Fridericia formula
it-ITItalian (Italy)QTC, intervallo:Tempo:Pt:Cuore:Qn:Formula Fridericia
Synonyms: Elettrocardiogramma - misurazioni Intervallo Q-T corretto Punto nel tempo (episodio) Tempo (e.g. secondi)
zh-CNChinese (China)QTC 间期:时间:时间点:心脏:定量型:Fridericia 公式
Synonyms: EKG QTC 间期（间隔、时间间隔、间隔时间）;QTC 间隔;QTC 时间间隔;QTC 间隔时间 可用数量表示的;定量性;数值型;数量型;连续数值型标尺 弗雷德里希亚公式;福雷德利西亚公式;弗氏公式;福氏公式 心 心动电流图 心动电流图.检测指标;心动电流图检测指标;心电图检测指标;检测指标 心动电流图描记器 心动电流描记器 心电图（Electrocardiogram，Electrocardiograph，EKG） 心电图仪 心电图描记器 心电图机 心电图机（Electrocardiograph，EKG） 心电图记录仪 心电描记器 心电机 心电记录仪 时刻;随机;随意;瞬间 时间(如秒);时间(如秒数)

Example Units

UnitSource
sExample UCUM Units

LOINC Terminology Service (API) using HL7® FHIR® Get Info

CodeSystem lookup
https://fhir.loinc.org/CodeSystem/$lookup?system=http://loinc.org&code=76634-5