LOINCActiveObservation

LOINC Code 10001-6: R wave duration in lead I

10001-6 is a LOINC code used to identify R wave duration in lead I 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 R wave duration.lead I. 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 R wave duration.lead I. 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: Observation
  • Method: EKG

What it does not mean

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

Key facts

  • R wave duration in lead I
  • R wave duration.lead I
  • Cardiac; Cardio; Cardiology; Durat; ECG; EKG.MEASUREMENTS; Electrocardiogram; Electrocardiograph; Heart Disease; Hrt; Painter's colic; PB; Plumbism; Point in time; QNT; Quan; Quant; Quantitative; R prime; R' wave dur L-I; R wave dur L-I; Random; Right

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

R wave duration in lead IR wave dur L-IR wave duration.lead IEKG.MEASTimePtHeart

Frequently asked questions

Code details

Code10001-6
SystemLOINC
Display nameR wave duration in lead I
DescriptionR wave duration.lead I
Short nameR wave dur L-I
ComponentR wave duration.lead I
PropertyTime
TimingPt
System (specimen)Heart
ScaleQn
MethodEKG
ClassEKG.MEAS
Example unitss
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0i
Last changed2.48

Part names

R wave duration.lead ITimePtHeartQnEKGTime (e.g. seconds)Point in time (spot)Electrocardiogram (EKG)

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.

LOINC Code 10001-6 | HealthAssure