Alkaline phosphatase activity in lyophilised quality control serum

Area of Science:

• Clinical Chemistry
• Laboratory Medicine
• Biochemistry

Background:

• Lyophilised quality control materials are essential for external quality assurance surveys.
• Alkaline phosphatase activity in these materials can change significantly after reconstitution.
• Variability in activity impacts the reliability of laboratory results.

Purpose of the Study:

• To investigate the factors affecting alkaline phosphatase (ALP) activity post-reconstitution.
• To develop an optimized protocol for reconstituting lyophilised control materials.
• To minimize variability in ALP activity for improved external quality control.

Main Methods:

• Studied 16 commercial lyophilised quality control preparations.
• Assessed the impact of storage temperature and analytical methods on ALP activity.
• Evaluated different reconstitution and storage conditions.

Main Results:

• Significant variations in ALP activity rise were observed among preparations.
• Mixing for 30 minutes at ambient temperature reduced variability.
• Storage at 4°C for no more than 4 hours before assay further minimized differences.

Conclusions:

• A standardized reconstitution protocol is crucial for lyophilised control materials.
• Optimized mixing and short-term cold storage ensure reliable ALP activity.
• Recommended protocol enhances the suitability of control materials for external quality surveys.