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.

LOINC

LOINC Code 64844-4: Equivalent visual acuity from table based on number of letters read correctly [PhenX]

Name: LOINC Code 64844-4: Equivalent visual acuity from table based on number of letters read correctly [PhenX]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:44.550Z

64844-4 is a LOINC code used to identify Equivalent visual acuity from table based on number of letters read correctly [PhenX] 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 Equivalent visual acuity from table based on number of letters read correctly. It is commonly used with the system or sample type ^Patient.

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 Equivalent visual acuity from table based on number of letters read correctly. It is commonly used with the system or sample type ^Patient.

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: TRIAL
Method: PhenX

What it does not mean

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

Key facts

Equivalent visual acuity from table based on number of letters read correctly [PhenX]
Equivalent visual acuity from table based on number of letters read correctly
Actual visual acuity is the measured visual acuity as defined by the number of letters that could be read from the chart at 4-meters
Finding; Findings; No; Nominal; Num; Point in time; Random; Refraction

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

Equivalent visual acuity from table based on number of letters read correctly [PhenX]Equivalent visual acuity PhenXEquivalent visual acuity from table based on number of letters read correctlyPHENXFindPt^Patient

Frequently asked questions

Code details

Code64844-4

SystemLOINC

Display nameEquivalent visual acuity from table based on number of letters read correctly [PhenX]

DescriptionEquivalent visual acuity from table based on number of letters read correctly

Short nameEquivalent visual acuity PhenX

ComponentEquivalent visual acuity from table based on number of letters read correctly

PropertyFind

TimingPt

System (specimen)^Patient

ScaleNom

MethodPhenX

ClassPHENX

StatusTRIAL

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.36

Last changed2.65

Part names

Equivalent visual acuity from table based on number of letters read correctlyFindPt^PatientNomPhenXFindingPoint 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.