Population-based stepwise screening for unrecognised Type 2 diabetes is ineffective in general practice despite...

Area of Science:

• Endocrinology
• Public Health
• General Practice

Background:

• Type 2 diabetes screening programs in healthcare settings may yield less than anticipated.
• Evaluating the reliability of screening algorithms and the effectiveness of a stepwise screening program in general practice is crucial.

Purpose of the Study:

• To assess the reliability of screening algorithms for Type 2 diabetes.
• To determine the effectiveness of a proposed stepwise screening program in general practice.

Main Methods:

• A four-step screening program was implemented: risk-chart, random blood glucose (RBG) and HbA1c tests, fasting blood glucose (FBG) diagnostic test, and oral glucose tolerance test (OGTT).
• The study included 60,926 patients aged 40-69 years across 88 general practices without a prior diabetes diagnosis.
• WHO 1999 criteria using capillary whole blood were used for classifying glucose metabolism abnormalities.

Main Results:

• Of 60,926 participants, 11,263 (18.5%) had a high-risk score and attended screening.
• 30.1% of those attending required diagnostic tests, and 27.2% of those required an OGTT.
• The identification rate of undiagnosed diabetes was only 19% of the estimated prevalent cases, largely due to high dropout rates among high-risk individuals.

Conclusions:

• Population-based, stepwise screening for Type 2 diabetes in general practice is ineffective.
• The screening algorithms demonstrated reliability from the second step onwards.
• Low participation rates among high-risk individuals significantly undermine the effectiveness of this screening approach.