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 40431-9: Osmotic fragility fresh (RBC control) [Interp]

Name: LOINC Code 40431-9: Osmotic fragility fresh (RBC control) [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:27.145Z

40431-9 is a LOINC code used to identify Osmotic fragility fresh (RBC control) [Interp] 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 Osmotic fragility^fresh. It is commonly used with the system or sample type RBC^Control.

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 Osmotic fragility^fresh. It is commonly used with the system or sample type RBC^Control.

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

Osmotic fragility [Interpretation] of Red Blood Cells from Control--fresh
Osmotic fragility^fresh
Contrl; Erythrocytes; Frag; Fragil; HEMATOLOGY/CELL COUNTS; Impression; Impression/interpretation of study; Impressions; Interp; Interpretation; Nominal; Normal; OF; Osmo; Osmo Frag; Point in time; Random; Red blood cells; Red blood corpusles

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

Osmotic fragility fresh (RBC control) [Interp]Osmotic fragility [Interpretation] of Red Blood Cells from Control--freshOF Fresh RBC Cont-ImpOsmotic fragility^freshHEM/BCOsmotic fragility Fresh, control Red blood cellsImp

Frequently asked questions

Code details

Code40431-9

SystemLOINC

Display nameOsmotic fragility fresh (RBC control) [Interp]

DescriptionOsmotic fragility^fresh

Short nameOF Fresh RBC Cont-Imp

ComponentOsmotic fragility^fresh

PropertyImp

TimingPt

System (specimen)RBC^Control

ScaleNom

ClassHEM/BC

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.15

Last changed2.73

Consumer names

Osmotic fragility Fresh, control Red blood cells

Part names

Osmotic fragility^freshImpPtRBC^controlNomImpression/interpretation of studyPoint 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.