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.

LOINCActiveObservation

LOINC Code 55422-0: Heart rate Encounter maximum

Name: LOINC Code 55422-0: Heart rate Encounter maximum
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:37.765Z

55422-0 is a LOINC code used to identify Heart rate Encounter maximum 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 Heart rate. It is commonly used with the system or sample type Arterial system.

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 Heart rate. It is commonly used with the system or sample type Arterial system.

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

What it does not mean

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

Key facts

Heart rate Encounter maximum
Heart rate
Art sys; Count/time; Encounter; Heart beat; HEART RATE.MOLEC; Maximum; nRate; Number rate; Number Rate = Count/Time; Pulse; QNT; Quan; Quant; Quantitative

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

Heart rate Encounter maximumHeart rate Enctr MaxHeart rateHRTRATE.MOLECMaximum Heart rate in EncounterNRatEnctr^max

Frequently asked questions

Code details

Code55422-0

SystemLOINC

Display nameHeart rate Encounter maximum

DescriptionHeart rate

Short nameHeart rate Enctr Max

ComponentHeart rate

PropertyNRat

TimingEnctr^max

System (specimen)Arterial system

ScaleQn

ClassHRTRATE.MOLEC

Example unitsbeats/min

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.27

Last changed2.73

Consumer names

Maximum Heart rate in Encounter

Part names

Heart rateNRatEnctr^maxArterial systemQnNumber Rate

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.