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 76138-7: Reticulocyte distribution width Calc (Bld) [Ratio]

Name: LOINC Code 76138-7: Reticulocyte distribution width Calc (Bld) [Ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:56.388Z

76138-7 is a LOINC code used to identify Reticulocyte distribution width Calc (Bld) [Ratio] 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 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 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 distribution width [Ratio] in Blood by calculation
Reticulocyte distribution width
This term was created for, but not limited in use to the ADVIA 120 System.
Blood; Calc; Calculation; Hematology; HEMATOLOGY/CELL COUNTS; Heme; Point in time; QNT; Quan; Quant; Quantitative; Random; Ratios; RDWr; Rto; 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 distribution width Calc (Bld) [Ratio]Reticulocyte distribution width [Ratio] in Blood by calculationRDWr Bld Calc-RtoReticulocyte distribution widthHEM/BCReticulocyte distribution width, BloodRatio

Frequently asked questions

Code details

Code76138-7

SystemLOINC

Display nameReticulocyte distribution width Calc (Bld) [Ratio]

DescriptionReticulocyte distribution width

Short nameRDWr Bld Calc-Rto

ComponentReticulocyte distribution width

PropertyRatio

TimingPt

System (specimen)Bld

ScaleQn

MethodCalculated

ClassHEM/BC

Example units%

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.52

Last changed2.52

Consumer names

Reticulocyte distribution width, Blood

Part names

Reticulocyte distribution widthRatioPtBldQnCalculatedPoint 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.