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.

LOINCActiveBoth

LOINC Code 76139-5: Reticulocyte hemoglobin distribution width Calc (Bld) [Mass/Vol]

Name: LOINC Code 76139-5: Reticulocyte hemoglobin distribution width Calc (Bld) [Mass/Vol]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:56.388Z

76139-5 is a LOINC code used to identify Reticulocyte hemoglobin distribution width Calc (Bld) [Mass/Vol] 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 Reticulocyte hemoglobin distribution width. It is commonly used with the system or sample type Bld.

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 Reticulocyte hemoglobin distribution width. It is commonly used with the system or sample type Bld.

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: Both
Method: Calculated

What it does not mean

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

Key facts

Reticulocyte hemoglobin distribution width [Mass/volume] in Blood by calculation
Reticulocyte hemoglobin distribution width
This term was created for, but not limited in use to the SIEMENS ADVIA 120 System.
Blood; Calc; Calculation; Haemoglobin; Hb; HDW; HDWr; Hematology; HEMATOLOGY/CELL COUNTS; Heme; Hgb; Level; Mass concentration; Point in time; QNT; Quan; Quant; Quantitative; Random; WB; Whole blood

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

Reticulocyte hemoglobin distribution width Calc (Bld) [Mass/Vol]Reticulocyte hemoglobin distribution width [Mass/volume] in Blood by calculationHDWr Bld Calc-mCncReticulocyte hemoglobin distribution widthHEM/BCReticulocyte hemoglobin distribution width, BloodMCnc

Frequently asked questions

Code details

Code76139-5

SystemLOINC

Display nameReticulocyte hemoglobin distribution width Calc (Bld) [Mass/Vol]

DescriptionReticulocyte hemoglobin distribution width

Short nameHDWr Bld Calc-mCnc

ComponentReticulocyte hemoglobin distribution width

PropertyMCnc

TimingPt

System (specimen)Bld

ScaleQn

MethodCalculated

ClassHEM/BC

Example unitsg/L

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.52

Last changed2.52

Consumer names

Reticulocyte hemoglobin distribution width, Blood

Part names

Reticulocyte hemoglobin distribution widthMCncPtBldQnCalculatedMass ConcentrationPoint in time (spot)Blood

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.