[Accuracy and reliability between glucose meters: A study under normal clinical practice conditions]

Area of Science:

• Clinical Chemistry
• Medical Devices
• Diabetes Management

Background:

• Glucose meters are widely used in primary care, with capillary and plasma glucose often used interchangeably.
• Device accuracy can be influenced by various factors, impacting clinical practice.
• This study evaluated the accuracy and reliability of commonly used glucose meters in a primary care setting.

Purpose of the Study:

• To assess the accuracy and reliability of three specific glucose meters (FreeStyle Optium OP1, OP2, and Accu-Chek Aviva).
• To compare device performance against plasma glucose (PG) as a reference standard.
• To determine if the devices meet the American Diabetes Association's accuracy standards.

Main Methods:

• Venous and capillary blood samples were collected from 59 participants.
• Capillary blood was analyzed using three glucose meters; venous blood provided plasma glucose (PG) reference values.
• Accuracy was assessed using Passing-Bablok regression, and reliability using intraclass correlation and Bland-Altman analysis.

Main Results:

• Systematic errors ranged from 5.8% to 6.3% for the tested glucose meters.
• The FreeStyle Optium pair (OP1/OP2) demonstrated high reliability (ICC=0.97, bias=-0.4mg/dL).
• Optimal accuracy and reliability were observed at higher plasma glucose levels (≥126 mg/dL).

Conclusions:

• While exhibiting clinically acceptable mean differences, none of the three glucose meters fully met the American Diabetes Association's ±5% total error standard.
• The study highlights the importance of ongoing quality control for glucose monitoring devices.
• Regular calibration and performance checks are crucial for ensuring reliable glucose measurements in primary care.