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 33516-6: Immature reticulocytes/Total reticulocytes (Bld)

Name: LOINC Code 33516-6: Immature reticulocytes/Total reticulocytes (Bld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:20.069Z

33516-6 is a LOINC code used to identify Immature reticulocytes/Total reticulocytes (Bld) 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 Reticulocytes.immature/Reticulocytes.total. 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 Reticulocytes.immature/Reticulocytes.total. 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: Observation

What it does not mean

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

Key facts

Immature reticulocytes/Reticulocytes.total in Blood
Reticulocytes.immature/Reticulocytes.total
IRF is index of erythropoietic activity. IRF is obtained by combining the sum of the medium (MFR) and high fluorescent reticulocyte (HFR) fractions.
Blood; Hematology; HEMATOLOGY/CELL COUNTS; Heme; Imm; Imm Retics; Immat; IRF; Number fraction; Percent; Point in time; Polychromatophilic red cells; QNT; Quan; Quant; Quantitative; Random; Retic; Retics; Reticulocyte; Shift cells; Stress cells; Tot; Totl; 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

Immature reticulocytes/Total reticulocytes (Bld)Immature reticulocytes/Reticulocytes.total in BloodImm Retics NFrReticulocytes.immature/Reticulocytes.totalHEM/BCImmature reticulocytes/Reticulocytes.total, BloodNFr

Frequently asked questions

Code details

Code33516-6

SystemLOINC

Display nameImmature reticulocytes/Total reticulocytes (Bld)

DescriptionReticulocytes.immature/Reticulocytes.total

Short nameImm Retics NFr

ComponentReticulocytes.immature/Reticulocytes.total

PropertyNFr

TimingPt

System (specimen)Bld

ScaleQn

ClassHEM/BC

Example units%

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.09

Last changed2.73

Consumer names

Immature reticulocytes/Reticulocytes.total, Blood

Part names

Reticulocytes.immature/Reticulocytes.totalNFrPtBldQnNumber FractionPoint 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.