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 66488-8: Serotonin release.heparin.unfractionated Nar (S) [Interp]

Name: LOINC Code 66488-8: Serotonin release.heparin.unfractionated Nar (S) [Interp]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:46.209Z

66488-8 is a LOINC code used to identify Serotonin release.heparin.unfractionated Nar (S) [Interp] 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 Serotonin release.heparin.unfractionated interpretation. It is commonly used with the system or sample type Ser.

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 Serotonin release.heparin.unfractionated interpretation. It is commonly used with the system or sample type Ser.

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

Serotonin release.heparin.unfractionated in Serum Narrative
Serotonin release.heparin.unfractionated interpretation
5-HT; 5-hydroxytryptamine; 5-hydroxytryptophane; C10H12N2O; Enteramine; Hep; Hepar; Heparin dependent platelet antibody; Heparn; Impression; Impression/interpretation of study; Impressions; Interp; Interpret; Interpretation; Interpt; Intrp; Narrative; Point in time; Random; Report; Serology; Serotonin release assay; Serum; SR; SRA; SRA UFH; UFH

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

Serotonin release.heparin.unfractionated Nar (S) [Interp]Serotonin release.heparin.unfractionated in Serum NarrativeSRA UFH Ser-ImpSerotonin release.heparin.unfractionated interpretationSEROSerotonin release.heparin.unfractionated, BloodImp

Frequently asked questions

Code details

Code66488-8

SystemLOINC

Display nameSerotonin release.heparin.unfractionated Nar (S) [Interp]

DescriptionSerotonin release.heparin.unfractionated interpretation

Short nameSRA UFH Ser-Imp

ComponentSerotonin release.heparin.unfractionated interpretation

PropertyImp

TimingPt

System (specimen)Ser

ScaleNar

ClassSERO

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.38

Last changed2.73

Consumer names

Serotonin release.heparin.unfractionated, Blood

Part names

Serotonin release.heparin.unfractionated interpretationImpPtSerNarSerotonin release.heparin.unfractionatedImpression/interpretation of studyPoint in time (spot)Serum

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.