LOINCActiveObservation

LOINC Code 56013-6: Platelet aggregation (Bld) [Rel units/Vol]

56013-6 is a LOINC code used to identify Platelet aggregation (Bld) [Rel units/Vol] 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 Platelet aggregation. It is commonly used with the system or sample type Bld.

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 Platelet aggregation. It is commonly used with the system or sample type Bld.

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
  • Method: Aggregometry.arachidonate induced ATP secretion.500 umol/L

What it does not mean

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

Key facts

  • Platelet aggregation in Blood by arachidonate induced ATP secretion 500 umol/L
  • Platelet aggregation
  • AA; AA ATP secr 500 umol/L; Agg; Aggr; Blood; COAGULATION; Hematology; Heme; Left; Levo; PA; Pl; Platelets; Platelt; Plt; Point in time; QNT; Quan; Quant; Quantitative; Random; RlACnc; Thrombocyte; Thrombocytes; WB; Whole blood

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

Platelet aggregation (Bld) [Rel units/Vol]Platelet aggregation in Blood by arachidonate induced ATP secretion 500 umol/LPA Bld AA ATP secr 500 umol/LPlatelet aggregationCOAGPlatelet Aggregation, BloodRelACnc

Frequently asked questions

Code details

Code56013-6
SystemLOINC
Display namePlatelet aggregation (Bld) [Rel units/Vol]
DescriptionPlatelet aggregation
Short namePA Bld AA ATP secr 500 umol/L
ComponentPlatelet aggregation
PropertyRelACnc
TimingPt
System (specimen)Bld
ScaleQn
MethodAggregometry.arachidonate induced ATP secretion.500 umol/L
ClassCOAG
StatusACTIVE
Order/ObservationObservation

Flags

BillableNo
Valid clinical useNo

Source

SourceLOINC
Version2.82
Releasemain
First released2.29
Last changed2.82

Consumer names

Platelet Aggregation, Blood

Part names

Platelet aggregationRelACncPtBldQnAggregometry.arachidonate induced ATP secretion.500 umol/LRelative Arbitrary ConcentrationPoint in time (spot)Bloodarachidonate induced ATP secretion 500 umol/L

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.

LOINC Code 56013-6 | HealthAssure