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 53577-3: Reason for study additional note Molgen Nar (Bld/Tiss)

Name: LOINC Code 53577-3: Reason for study additional note Molgen Nar (Bld/Tiss)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:36.030Z

53577-3 is a LOINC code used to identify Reason for study additional note Molgen Nar (Bld/Tiss) 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 Reason for study additional note. It is commonly used with the system or sample type Bld/Tiss.

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 Reason for study additional note. It is commonly used with the system or sample type Bld/Tiss.

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: Molgen

What it does not mean

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

Key facts

Reason for study

Reason for study additional note

The freeform text that is entered by the ordering provider to further annotate the coded Reason for Study [LOINC51967-8] associated with an ordered test. In HL7 v2 messages, OBR-31 should be used to report the reason for study.

Add; Blood; Encounter; Evaluation and management; Evaluation and management note; Genetic; Genetics; Genomic; HL7.GENETICS; Molecular genetics; MOLPATH.GENERAL; Narrative; notes; PCR; Point in time; Random; Report; Study report; Text; Tissue; Tissue, unspecified; Visit note; WB; Whole blood; Whole blood or Tissue

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

Reason for study additional note Molgen Nar (Bld/Tiss)Reason for studyReason for study additional noteHL7.GENETICSReason for study additional note, Blood or tissue specimenTxtPt

Frequently asked questions

Code details

Code53577-3

SystemLOINC

Display nameReason for study additional note Molgen Nar (Bld/Tiss)

DescriptionReason for study additional note

Short nameReason for study

ComponentReason for study additional note

PropertyTxt

TimingPt

System (specimen)Bld/Tiss

ScaleNar

MethodMolgen

ClassHL7.GENETICS

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.26

Last changed2.73

Consumer names

Reason for study additional note, Blood or tissue specimen

Part names

Reason for study additional noteTxtPtBld/TissNarMolgenTextPoint in time (spot)Blood or TissueMolecular genetics

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.