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.

LOINCActiveBoth

LOINC Code 80658-8: ACT Diatomaceous earth induced (Bld)

Name: LOINC Code 80658-8: ACT Diatomaceous earth induced (Bld)
Creator: HealthAssure Clinical Team
Published: 2026-05-21T09:00:03.793Z

80658-8 is a LOINC code used to identify ACT Diatomaceous earth induced (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: Both
Method: Coag.diatomaceous earth 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 induced by Diatomaceous earth

Activated clotting time

This is a point-of-care electrochemical assay that measures venous or arterial whole blood activated clotting time (ACT) by using a Celite clot activator, which stimulates the intrinsic coagulation pathway. Celite is the commonly-used brand name of the diatomaceous earth (a naturally occurring, soft, siliceous sedimentary rock) used in ACT assays. Different activators result in different clotting times. For example, the ACT reference ranges for glass, kaolin and Celite are 110-190 sec, 90-150 sec and 100-170 sec, respectively. [http//www.practical-haemostasis.com/Miscellaneous/Miscellaneous%20Tests/act.html] In addition, aprotinin may affect the ACT result when Celite is used, therefore, the test is not recommended for use with patients receiving aprotinin. The ACT is primarily used to monitor a patient's state of anticoagulation due to heparin that is administered during a medical or surgical procedure. It is commonly employed in cardiac catheterization, percutaneous transluminal coronary angioplasty (PTCA), renal dialysis, hemodialysis, and extra-corporeal circulation during bypass. This term was created for, but not limited in use to, the submitter's Abbott Celite activated clotting time test kit.

ACT; Activ; Activated coagulation time; Blood; Celite; Clot; Clot tm; Clottable; Coag.celite; COAGULATION; Coagulation activated; Coagulation assay; Coagulation time; Hematology; Heme; Point in time; QNT; Quan; Quant; Quantitative; Random; Rate; R-time; 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

ACT Diatomaceous earth induced (Bld)Activated clotting time (ACT) of Blood induced by Diatomaceous earthACT Bld Diatomaceous earth indActivated clotting timeCOAGActivated clotting time, BloodTime

Frequently asked questions

Code details

Code80658-8

SystemLOINC

Display nameACT Diatomaceous earth induced (Bld)

DescriptionActivated clotting time

Short nameACT Bld Diatomaceous earth ind

ComponentActivated clotting time

PropertyTime

TimingPt

System (specimen)Bld

ScaleQn

MethodCoag.diatomaceous earth induced

ClassCOAG

Example unitss

StatusACTIVE

Order/ObservationBoth

Flags

BillableNo

Valid clinical useNo

Source

SourceLOINC

Version2.82

Releasemain

First released2.56

Last changed2.82

Consumer names

Activated clotting time, Blood

Part names

Activated clotting timeTimePtBldQnCoag.diatomaceous earth inducedActivated clotting time (ACT)Time (e.g. seconds)Point in time (spot)BloodDiatomaceous earth induced

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.