Blood collection while using a continuous glucose analyzer without insertion of an additional venous catheter

Area of Science:

• Biomedical Engineering
• Clinical Chemistry

Background:

• Continuous glucose monitoring is crucial for diabetes management.
• Existing methods may have limitations in blood sample handling for additional assays.

Purpose of the Study:

• To describe a modified Biostator method for continuous blood collection.
• To evaluate the impact of this method on blood glucose measurements and sample yield.

Main Methods:

• Utilizing a double lumen catheter and an infusion pump's optional channel for blood withdrawal.
• Collecting excess blood into assay tubes for secondary analysis.
• Calculating a dilution factor based on tubing diameter to correct for sample dilution.

Main Results:

• Continuous collection of diluted heparinized blood was achieved.
• A mean volume of 1.21 +/- 0.07 ml/10 min was collected using a 0.020-inch lumen diameter tube.
• The method showed no significant impact on blood glucose measurement accuracy (r = 0.9572).

Conclusions:

• The described modification provides a reliable method for continuous blood collection alongside glucose monitoring.
• This technique allows for additional blood assays without compromising the primary glucose measurement.
• Further research may involve optimizing dilution correction factors for various experimental conditions.