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.

LOINCOrder

LOINC Code 50738-4: Serotonin release.heparin.low molecular weight panel (S)

Name: LOINC Code 50738-4: Serotonin release.heparin.low molecular weight panel (S)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T08:59:34.496Z

50738-4 is a LOINC code used to identify Serotonin release.heparin.low molecular weight panel (S) 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.low molecular weight panel. 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.low molecular weight panel. 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: DISCOURAGED
Order vs observation: Order
Panel type: Panel

What it does not mean

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

Key facts

Serotonin release.heparin.low molecular weight panel - Serum
Serotonin release.heparin.low molecular weight panel
5-HT; 5-hydroxytryptamine; 5-hydroxytryptophane; C10H12N2O; Clexane; Enoxaparin; Enteramine; Hep; Hepar; Heparin dependent platelet antibody; Heparn; LMWH; Lovenox; Pan; PANEL.SEROLOGY; Panl; Pnl; Point in time; Random; Serology; Serotonin release assay; Serum; SR; SRA; SRA LMW Pnl; Wt

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.low molecular weight panel (S)Serotonin release.heparin.low molecular weight panel - SerumSRA LMW Pnl SerSerotonin release.heparin.low molecular weight panelPANEL.SEROSerotonin release.heparin.low molecular weight panel, Blood-

Frequently asked questions

Code details

Code50738-4

SystemLOINC

Display nameSerotonin release.heparin.low molecular weight panel (S)

DescriptionSerotonin release.heparin.low molecular weight panel

Short nameSRA LMW Pnl Ser

ComponentSerotonin release.heparin.low molecular weight panel

Property-

TimingPt

System (specimen)Ser

Scale-

ClassPANEL.SERO

StatusDISCOURAGED

Order/ObservationOrder

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.22

Last changed2.52

Consumer names

Serotonin release.heparin.low molecular weight panel, Blood

Part names

Serotonin release.heparin.low molecular weight panel-PtSerPoint 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.