Development and validation of an automated thawing and mixing workcell

Area of Science:

• Clinical laboratory science
• Automation and robotics in healthcare
• Specimen processing and analysis

Background:

• High-volume clinical laboratories face challenges with manual processing of frozen specimens.
• Specimen freezing and thawing can lead to concentration gradients, affecting test accuracy.
• Total laboratory automation requires efficient handling of frozen samples.

Purpose of the Study:

• To develop and validate an automated workcell for thawing and mixing frozen specimens.
• To address the need for automation in high-volume laboratory sections.
• To ensure specimen integrity after automated thawing and mixing.

Main Methods:

• A robotic workcell was designed to retrieve, thaw using high-velocity air, mix, and return specimens.
• Thawing times and temperatures were monitored using immersed thermocouples.
• Mixing effectiveness was assessed by analyzing aliquots for total protein and electrolytes.

Main Results:

• Specimens reached room temperature within 23 minutes using high-velocity ambient air.
• Effective mixing was achieved with minimal robotic movements (2 x 126 degrees).
• Overfilled frozen tubes showed lower analyte concentrations due to solute leakage.

Conclusions:

• A high-throughput automated workcell for thawing and mixing frozen specimens was successfully developed.
• The workcell was validated and integrated into an automated transport and sorting system.
• This automation contributes to the goal of total laboratory automation.