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LOINC Code 50729-3: Serotonin release 100 U/mL heparin.porcine Qn (S)

50729-3 is a LOINC code used to identify Serotonin release 100 U/mL heparin.porcine Qn (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 100 U/mL heparin.porcine. 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 100 U/mL heparin.porcine. 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: DEPRECATED
  • Order vs observation: Observation

What it does not mean

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

Key facts

Deprecated Serotonin release 100 U/mL heparin.porcine [Units/volume] in Serum
Serotonin release 100 U/mL heparin.porcine
Resulted as percentage of specific serotonin release(cpm test - cpm spont)/(cpm max - cpm spont) x 100, where cpm "spont" is the spontaneous release of [3H]serotonin from cells incubated in absence of antibodies, and cpm "max" is the maximum release of [3H]serotonin from cells lysed using 1% Triton X-100.
5-HT; 5-hydroxytryptamine; 5-hydroxytryptophane; Arbitrary concentration; C10H12N2O; Enteramine; Hep; Hepar; Heparin dependent platelet antibody; Heparn; high dose; Point in time; Pork; QNT; Quan; Quant; Quantitative; Random; Serology; Serotonin release assay; Serum; SR; SRA; SRA 100U; SRA porcine high; Swine

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 100 U/mL heparin.porcine Qn (S)Deprecated Serotonin release 100 U/mL heparin.porcine [Units/volume] in SerumDeprecated SRA 100U/mL porcine heparin SSerotonin release 100 U/mL heparin.porcineSEROSerotonin Release 100 U/mL Heparin.porcine, BloodACnc

Frequently asked questions

Code details

Code50729-3
SystemLOINC
Display nameSerotonin release 100 U/mL heparin.porcine Qn (S)
DescriptionSerotonin release 100 U/mL heparin.porcine
Short nameDeprecated SRA 100U/mL porcine heparin S
ComponentSerotonin release 100 U/mL heparin.porcine
PropertyACnc
TimingPt
System (specimen)Ser
ScaleQn
ClassSERO
Example units%
StatusDEPRECATED
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.22
Last changed2.70

Consumer names

Serotonin Release 100 U/mL Heparin.porcine, Blood

Part names

Serotonin release 100 U/mL heparin.porcineACncPtSerQnArbitrary ConcentrationPoint 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.