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After administrating either combinations of the diagnostic tests, three diagnostic outcome
scenarios are possible, namely that the individual is 1) unlikely to have diabetes (healthy);
2) falls under the pre-diabetic range (prediabetes) and has either impaired fasting glucose
(IFG) or impaired glucose tolerance (IGT); or 3) has diabetes mellitus (DM).

Table 2
Testing results and diagnoses

Round 1 Test Results Round 2 Test Results Diagnostic State
HbA1c<6.5%, FPG<6.1 mmol/L N/a Diabetes Unlikely

HbA1c<6.5%, FPG 6.1-6.9 FPG<6.1 mmol/L, OGTT Diabetes Unlikely
mmol/L Post<7.8 mmol/L
FPG 6.1-6.9 mmol/L, OGTT Impaired Fasting Glucose
Post <7.8 mmol/L (Prediabetes)

FPG<7 mmol/L, OGTT Impaired Glucose
Post>=7.8–11.0 mmol/L Tolerance (Prediabetes)
OGTT Post>=11.1 mmol/L Diabetes Confirmed
HbA1c<6.5%, FPG>=7.0 mmol/L HbA1c<6.5%, FPG>=7.0 Diabetes Confirmed
mmol/L;

HbA1c>=6.5%, FPG any value HbA1c>=6.5%, FPG any value; Diabetes Confirmed

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