What does this LOINC code represent?

This LOINC code identifies a lab observation, measurement, question, or clinical concept in a standardized format.

Is this enough to understand my test result?

No. The code identifies the test or observation, but the interpretation depends on the actual result, reference range, and clinical context.

LOINCActiveBoth

LOINC Code 76635-2: Q-T interval corrected based on Bazett formula

Name: LOINC Code 76635-2: Q-T interval corrected based on Bazett formula
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:57.646Z

76635-2 is a LOINC code used to identify Q-T interval corrected based on Bazett formula in laboratory and clinical observation data. You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges. LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component QTc interval. It is commonly used with the system or sample type Heart.

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

LOINC codes identify tests, measurements, observations, survey items, and clinical questions in a standardized way. It is associated with the component QTc interval. It is commonly used with the system or sample type Heart.

When is it used?

Used in lab systems, EHRs, and clinical data exchange.
May identify a test, observation, survey item, or clinical document request rather than a diagnosis.
Status: ACTIVE
Order vs observation: Both
Method: Bazett formula

What it does not mean

The code identifies the observation or test, not the actual result.

Key facts

Q-T interval corrected based on Bazett formula

QTc interval

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. [PMID23972343] 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.

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

Where you may see this code

You may see this code in lab systems, lab reports, EHR exports, interoperability feeds, or other structured clinical data exchanges.

Common synonyms

Q-T interval corrected based on Bazett formulaQ-T interval corrected BazettQTc intervalEKG.MEASTimePtHeart

Frequently asked questions

Code details

Code76635-2

SystemLOINC

Display nameQ-T interval corrected based on Bazett formula

DescriptionQTc interval

Short nameQ-T interval corrected Bazett

ComponentQTc interval

PropertyTime

TimingPt

System (specimen)Heart

ScaleQn

MethodBazett formula

ClassEKG.MEAS

Example unitss

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.52

Last changed2.52

Part names

QTC intervalTimePtHeartQnBazett formulaQ-T interval correctedTime (e.g. seconds)Point in time (spot)

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from LOINC. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.