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 96681-2: ACT (Bld)

Name: LOINC Code 96681-2: ACT (Bld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:27.591Z

96681-2 is a LOINC code used to identify ACT (Bld) 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 Activated clotting time. 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 Activated clotting time. 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: Microviscometry.diatomaceous earth and clay induced

What it does not mean

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

Key facts

Activated clotting time (ACT) of Blood by Microviscometry.diatomaceous earth and clay induced
Activated clotting time
ACT; Activ; Activated coagulation time; Blood; Celite; Clot; Clot tm; Clottable; COAGULATION; Coagulation activated; Coagulation time; Hematology; Heme; MicrVisc; Point in time; QNT; Quan; Quant; Quantitative; Random; Rate; R-time; 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

ACT (Bld)Activated clotting time (ACT) of Blood by Microviscometry.diatomaceous earth and clay inducedACT Bld Microviscometry.diatomaceous earth and clay inducedActivated clotting timeCOAGActivated clotting time, BloodTime

Frequently asked questions

Code details

Code96681-2

SystemLOINC

Display nameACT (Bld)

DescriptionActivated clotting time

Short nameACT Bld Microviscometry.diatomaceous earth and clay induced

ComponentActivated clotting time

PropertyTime

TimingPt

System (specimen)Bld

ScaleQn

MethodMicroviscometry.diatomaceous earth and clay induced

ClassCOAG

Example unitss

StatusACTIVE

Order/ObservationObservation

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.69

Last changed2.82

Consumer names

Activated clotting time, Blood

Part names

Activated clotting timeTimePtBldQnMicroviscometry.diatomaceous earth and clay inducedActivated clotting time (ACT)Time (e.g. seconds)Point in time (spot)Blood

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.