Prevalence of Undiagnosed Diabetes and Prediabetes in the Dental Setting: A Systematic Review and Meta-Analysis

Table 1

Diagnostic criteria for DM and hyperglycaemia adopted by the WHO and ADA.

Diabetes
FPG	≥7.0 mmol/L (126 mg/dl) or
2-hour OGTT	≥11.1 mmol/L (200 mg/dl) or
HbA1c	≥6.5%
Hyperglycaemia (prediabetes range)
Impaired glucose tolerance (IGT)
FPG	<7.0 mmol/L (126 mg/dl)
2-hour OGTT	≥7.8 and <11.1 mmol/L (140 mg/dl and 200 mg/dl)
Impaired fasting glucose (IFG)
Fasting plasma glucose	6.1 to 6.9 mmol/L (110 mg/dl to 125 mg/dl)
2-hour OGTT	<7.8 mmol/L (140 mg/dl)
HbA1c	A1C ≥ 5.7 to 6.4% (39–47 mmol/mol)

Criteria recommended by the American Diabetes Association alone; FPG, fasting plasma glucose; OGTT, oral glucose tolerance test; HbA1c, glycated haemoglobin; IFG, impaired fasting glucose; IGT, impaired glucose tolerance.