Preanalytical factors and their influence on analytical quality specifications

Area of Science:

• Clinical Chemistry
• Laboratory Medicine
• Diagnostic Process Quality

Background:

• Analytical standards for quality control are well-established.
• No comparable standards currently exist for the preanalytical phase of diagnostics.
• The preanalytical phase significantly impacts the accuracy of laboratory test results.

Purpose of the Study:

• To define quality criteria for the preanalytical phase in clinical diagnostics.
• To establish recommendations for materials and processes from patient to analytical step.
• To improve the reliability and consistency of laboratory testing.

Main Methods:

• A working group from the German Society of Clinical Chemistry and Laboratory Medicine convened.
• Recommendations were developed based on discussions from five European expert meetings.
• Published national guidelines and a book format were utilized for dissemination.

Main Results:

• Defined quality criteria for sample adequacy, quantity, anticoagulants, and stabilizers.
• Established criteria for sample timing, transport, and storage, focusing on stability and preanalytical treatment.
• Outlined documentation requirements for sample identification, storage, and management of interference factors in quality manuals.

Conclusions:

• Recommendations provide a framework for standardizing preanalytical quality control.
• Implementing these criteria can enhance the overall quality and reliability of the diagnostic process.
• Standardized preanalytical procedures are crucial for accurate patient diagnosis and treatment.