title: Diabetes mellitus: diagnosis and screening.
abstract: Based on etiology, diabetes is classified as type 1 diabetes mellitus, type 2 diabetes mellitus, latent autoimmune diabetes, maturity-onset diabetes of youth, and miscellaneous causes. The diagnosis is based on measurement of A1C level, fasting or random blood glucose level, or oral glucose tolerance testing. Although there are conflicting guidelines, most agree that patients with hypertension or hyperlipidemia should be screened for diabetes. Diabetes risk calculators have a high negative predictive value and help define patients who are unlikely to have diabetes. Tests that may help establish the type of diabetes or the continued need for insulin include those reflective of beta cell function, such as C peptide levels, and markers of immune-mediated beta cell destruction (e.g., autoantibodies to islet cells, insulin, glutamic acid decarboxylase, tyrosine phosphatase [IA-2a and IA-2beta]). Antibody testing is limited by availability, cost, and predictive value.
authors.affiliation: The Ohio State University, Columbus, OH, USA.
authors.forename: Parita
authors.initials: P
authors.lastname: Patel
authors.forename: Allison
authors.initials: A
authors.lastname: Macerollo
mesh_terms: D001786:Blood Glucose / Q000032:analysis; D003922:Diabetes Mellitus, Type 1 / Q000175:diagnosis*; D003924:Diabetes Mellitus, Type 2 / Q000175:diagnosis*; D016640:Diabetes, Gestational / Q000175:diagnosis*; D005260:Female; D005951:Glucose Tolerance Test; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D007330:Insulin Antibodies / Q000097:blood; D008297:Male; D011237:Predictive Value of Tests; D011247:Pregnancy
chemical_list: D001786:Blood Glucose; D006442:Glycated Hemoglobin; D007330:Insulin Antibodies