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Oral glucose tolerance test (OGTT) is a sensitive and reliable test for diabetes mellitus and impaired glucose tolerance (IGT). However, poor patient tolerance of glucose solutions is common. We aim to compare the diagnostic value of an ice cream test with a standard OGTT.A total of 104 healthy adults were randomly assigned to either 75-g OGTT or ice cream, followed by a crossover to the other test.Most patients were females (71%). Mean age was 37 ± 12 years, and body mass index was 24.2 ± 3.9 kg/m2. Diabetes mellitus and IGT, as diagnosed by 75-g OGTT, were 4.8% and 6.7%, respectively. The 2-hour plasma glucose levels were 110 ± 55.5 mg/dL with 75-g glucose and 97.52 ± 40.7 mg/dL with ice cream. The correlation coefficient of 2-hour plasma glucose for the 2 tests was 0.82 (95% CI: 0.75-0.87; P < 0.001). Discordant diagnostic results, based on 2-hour plasma glucose levels, were 9.61%. By using a combination of fasting plasma glucose and 2-hour plasma glucose values, the ice cream test would have missed 5.76% of those at high risk for diabetes mellitus (impaired fasting glucose and IGT) or diabetes.An ice cream test may serve as an alternative to a 75-g OGTT. Before applying this test in clinical practice, it needs to be validated in a larger population.