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 12185-5: Coagulation aPTT (Bld control) [Time]

Name: LOINC Code 12185-5: Coagulation aPTT (Bld control) [Time]
Creator: HealthAssure Clinical Team
Published: 2026-05-21T11:17:22.975Z

12185-5 is a LOINC code used to identify Coagulation aPTT (Bld control) [Time] 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 Coagulation. It is commonly used with the system or sample type Bld^Control.

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 Coagulation. It is commonly used with the system or sample type Bld^Control.

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: Coag.surface induced

What it does not mean

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

Key facts

aPTT in Blood from Control by Coagulation assay
Coagulation
aPTT; Blood; Clot; Clottable; Coag; Coagulation assay; Contrl; Hematology; Heme; Normal; Point in time; QNT; Quan; Quant; Quantitative; Random; Surf; Tilt tube; 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

Coagulation aPTT (Bld control) [Time]aPTT in Blood from Control by Coagulation assayaPTT Bld ContCoagulationCOAGCoagulation, control BloodTime

Frequently asked questions

Code details

Code12185-5

SystemLOINC

Display nameCoagulation aPTT (Bld control) [Time]

DescriptionCoagulation

Short nameaPTT Bld Cont

ComponentCoagulation

PropertyTime

TimingPt

System (specimen)Bld^Control

ScaleQn

MethodCoag.surface induced

ClassCOAG

Example unitss

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released1.0j-a

Last changed2.82

Consumer names

Coagulation, control Blood

Part names

CoagulationTimePtBld^controlQnCoag.surface inducedTime (e.g. seconds)Point in time (spot)Blood^ControlaPTT

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.