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 34402-8: Coproporphyrin/Hemoglobin (RBC) [Mass ratio]

Name: LOINC Code 34402-8: Coproporphyrin/Hemoglobin (RBC) [Mass ratio]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:21.188Z

34402-8 is a LOINC code used to identify Coproporphyrin/Hemoglobin (RBC) [Mass 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 Coproporphyrin/Hemoglobin. 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 Coproporphyrin/Hemoglobin. 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

What it does not mean

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

Key facts

Coproporphyrin/Hemoglobin [Mass Ratio] in Red Blood Cells
Coproporphyrin/Hemoglobin
Chemistry; Copro; Coproporph; Coproporphyrins; Erythrocytes; Haemoglobin; Hb; Hgb; Mass concentration ratio; Mass ratio; MCRto; Point in time; QNT; Quan; Quant; Quantitative; Random; Red blood cells; Red blood corpusles; Tetracarboxyl porphyrin; Tetracarboxylporphyrin; Tetracarboxylporphyrins; Tetracarboxyporphyrin

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

Coproporphyrin/Hemoglobin (RBC) [Mass ratio]Coproporphyrin/Hemoglobin [Mass Ratio] in Red Blood CellsCopro/Hgb RBCCoproporphyrin/HemoglobinCHEMCoproporphyrin/Hemoglobin, Red blood cellsMRto

Frequently asked questions

Code details

Code34402-8

SystemLOINC

Display nameCoproporphyrin/Hemoglobin (RBC) [Mass ratio]

DescriptionCoproporphyrin/Hemoglobin

Short nameCopro/Hgb RBC

ComponentCoproporphyrin/Hemoglobin

PropertyMRto

TimingPt

System (specimen)RBC

ScaleQn

ClassCHEM

Example unitsug/g

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.10

Last changed2.70

Consumer names

Coproporphyrin/Hemoglobin, Red blood cells

Part names

Coproporphyrin/HemoglobinMRtoPtRBCQnMass RatioPoint in time (spot)Red Blood Cells

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.