Coagulometry and Hemostasis Testing

Automated coagulation analyzer for hemostasis testing

Coagulometry is a branch of laboratory diagnostics that studies the blood clotting system (hemostasis). Coagulation analyzers measure clot formation time and the activity of clotting factors, which is critical for diagnosing hemostatic disorders, monitoring anticoagulant therapy and preoperative assessment.

Clot Detection Methods

Modern coagulation analyzers use several principles to detect the moment a fibrin clot forms.

Method	Principle
Optical (turbidimetric)	Detects the change in light transmission as the clot forms
Mechanical	Measures viscosity via changes in the movement of a steel ball or in oscillation
Chromogenic	Measures the colored product of an enzymatic reaction
Immunoturbidimetric	Quantifies specific hemostasis proteins

Key Hemostasis Parameters

PT (prothrombin time) / INR: assesses the extrinsic pathway; used to monitor warfarin
aPTT: assesses the intrinsic pathway; used to monitor heparin therapy
Fibrinogen: concentration of this key clotting protein
Thrombin time: the final stage of coagulation
D-dimer: a marker of thrombus formation and fibrinolysis
Individual factor activity: diagnosis of hemophilias and factor deficiencies

Clinical Significance

Hemostasis testing is needed before surgery, in the diagnosis of thrombosis and bleeding, in pregnancy management, and for monitoring anticoagulant and antiplatelet therapy. The accuracy of coagulation tests depends directly on pre-analytics (the correct blood-to-citrate ratio) and regular quality control.

Learn more in our article on external quality assessment in coagulation.

Frequently Asked Questions

How does an optical coagulation analyzer differ from a mechanical one?

An optical analyzer detects the change in light transmission as a clot forms, while a mechanical analyzer detects the change in the viscosity of the medium. Mechanical methods are less sensitive to sample turbidity and hemolysis.

What does the INR show?

The INR (international normalized ratio) is a standardized expression of prothrombin time and is used to monitor therapy with vitamin K antagonists (warfarin).

Why are pre-analytics important in coagulation testing?

An incorrect blood-to-anticoagulant ratio, hemolysis or delayed analysis distort the results. Standardized blood collection is a prerequisite for reliable results.

Choosing a Coagulation Analyzer

KombiMED GmbH is an independent partner for procurement and market access for laboratory equipment from Europe. We will help you choose a coagulation analyzer and reagents to match your laboratory's volume and profile, and we provide delivery, installation and commissioning, and staff training.

See also:

Analytical methods in clinical chemistry: an overview
Immunoturbidimetry and nephelometry for protein analysis
Laboratory diagnostics: our services
Contact KombiMED for help selecting equipment