The glucose tolerance test can be performed in a variety of situations. To evaluate a person's capacity to manage a glucose load, a glucose tolerance test is utilised. The test can determine whether or not a person can metabolise a specific amount of glucose. and oral glucose tolerance test (OGTT) has been the standard method for detecting prediabetes and type 2 diabetes. Diabetes causes anomalies in glucose, lipid, and protein metabolism due to insulin's ineffective action on target tissues, so health care providers making this test to determine a person's ability to handle a glucose load. In this article we will be looking at the testing procedures, normal and abnormal results and primary heath care role's to improve the results and treatmentof prediabetics .