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Instrument Calibration

Instrument Calibration

Instrument calibration is essential for ensuring that instruments produce accurate and consistent results. It is vital in manufacturing, healthcare, testing laboratories, and scientific research. Calibration processes are specific to each instrument and help enhance data accuracy. Each instrument has a unique calibration process tailored to its design and function to improve data accuracy.
Analytical Balance Calibration
An analytical balance measures mass and requires regular calibration to...

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Related Experiment Video

Updated: Sep 9, 2025

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay

Published on: September 9, 2012

Drug-Specific Calibration: A Solution to Reagent Variability in Extended Half-Life Factor IX Activity Measurements.

François Grand¹, Florence Blanc-Jouvan², Guillaume Mourey³

¹CHU de Poitiers, Laboratoire d'hématologie biologique, Poitiers, France.

Haemophilia : the Official Journal of the World Federation of Hemophilia

|September 3, 2025

Summary

This summary is machine-generated.

Drug-specific calibration for extended half-life recombinant factor IX (EHL-rFIX) concentrates significantly reduces measurement discrepancies in one-stage clotting assays (OSAs). This improves haemophilia B treatment monitoring by standardizing results across different activated partial thromboplastin time (APTT) reagents.

Keywords:

calibration drug monitoring factor IX haemophilia B recombinant fusion proteins

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Area of Science:

Biochemistry
Clinical Diagnostics
Haematology

Background:

One-stage clotting assays (OSAs) show discrepancies in measuring factor IX activity (FIX:C) after EHL-rFIX infusions.
Variations in activated partial thromboplastin time (APTT) reagents are a primary cause of these measurement issues.
These discrepancies complicate clinical decisions for haemophilia B patients.

Purpose of the Study:

To assess if drug-specific calibrations for albumin-fused (rFIX-FP) and Fc-fused (rFIX-Fc) recombinant FIX could minimize inter-reagent variability.
To improve the accuracy and consistency of FIX:C measurements in haemophilia B management.

Main Methods:

A multicentre study involved 20 laboratories testing plasma samples with rFIX-FP, rFIX-Fc, or standard rFIX.
FIX:C was measured using both standard and drug-specific calibrations with various APTT reagents.
Analysis focused on compliance rates (80%-120% target), interlaboratory variability, and intralaboratory reproducibility.

Main Results:

Standard calibration showed wide compliance variations among reagents.
Drug-specific calibration substantially enhanced compliance for most reagents and EHL-rFIX types.
Interlaboratory variability (CV) decreased from 19.4%-36.0% to 6.0%-12.4% with specific calibration.
Intralaboratory reproducibility remained consistent regardless of calibration method.

Conclusions:

Drug-specific calibration effectively reduces reagent-dependent variability in OSA FIX assays for EHL-rFIX.
This standardization ensures reliable FIX:C monitoring, enhancing laboratory efficiency.
Widespread availability of validated calibrators is essential for broader adoption and consistent haemophilia B care.