LOINCActiveObservation

LOINC Code 12241-6: Osmotic fragility Diluted RBC (RBC)

12241-6 is a LOINC code used to identify Osmotic fragility Diluted RBC (RBC) 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. It is commonly used with the system or sample type RBC.

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. It is commonly used with the system or sample type RBC.

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: RBCs diluted

What it does not mean

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

Key facts

  • Osmotic fragility of Red Blood Cells by Diluted RBC
  • Osmotic fragility
  • Absorbance of patient and control measured by sphectrophotometer - MCF=ABS(patient)/ABS(100% control hemolysis)
  • Diluted RBC; Erythrocytes; Frag; Fragil; HEMATOLOGY/CELL COUNTS; Number Fraction; OF; Osmo; Osmo Frag; Percent; Point in time; QNT; Quan; Quant; Quantitative; 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 Diluted RBC (RBC)Osmotic fragility of Red Blood Cells by Diluted RBCOF NFr RBC DilutedOsmotic fragilityHEM/BCOsmotic fragility, Red blood cellsNFr

Frequently asked questions

Code details

Code12241-6
SystemLOINC
Display nameOsmotic fragility Diluted RBC (RBC)
DescriptionOsmotic fragility
Short nameOF NFr RBC Diluted
ComponentOsmotic fragility
PropertyNFr
TimingPt
System (specimen)RBC
ScaleQn
MethodRBCs diluted
ClassHEM/BC
Example units%
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released1.0j-a
Last changed2.73

Consumer names

Osmotic fragility, Red blood cells

Part names

Osmotic fragilityNFrPtRBCQnRBCs dilutedNumber FractionPoint in time (spot)Red Blood CellsDiluted RBC

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 12241-6 | HealthAssure