Type 2 Diabetes Mellitus Differential Diagnoses
- Author: Romesh Khardori, MD, PhD, FACP; Chief Editor: George T Griffing, MD more...
Diagnostic Considerations
Type 2 diabetes mellitus can usually be differentiated from type 1 diabetes mellitus on the basis of history and physical examination findings and simple laboratory tests.
Correctly determining whether a patient has type 1 or type 2 diabetes is important because patients with type 1 diabetes are dependent on a continuous source of exogenous insulin and carbohydrates for survival. Patients with type 2 diabetes may not need treatment of hyperglycemia during periods of fasting or decreased oral intake.
A patient whose diabetes is controlled with diet or an oral antidiabetic agent clearly has type 2 diabetes. A lean patient who has had diabetes since childhood, who has always been dependent on insulin, or who has a history of diabetic ketoacidosis (DKA) almost certainly has type 1 diabetes.
When dealing with patients with known diabetes in the emergency department, distinguishing the type of diabetes can be difficult in 2 groups: patients who are treated with insulin and are young but clinically appear to have type 2 diabetes; and older patients with late onset of diabetes who nonetheless take insulin and seem to share characteristics of patients with type 1 diabetes. (This latter group is now said to have latent autoimmune diabetes of the adult [LADA]).
When in doubt, the patient should be treated with insulin and his or her glucose levels should be closely monitored. Some adolescents or young adults, mostly Hispanic or African American patients, who present with classic DKA are subsequently found to have type 2 diabetes.
Pre-diabetes
Pre-diabetes often precedes overt type 2 diabetes. Pre-diabetes is defined by a fasting blood glucose level of 100-125 mg/dL or a 2-hour post oral glucose tolerance test (OGTT) glucose level of 140-200 mg/dL. Persons with pre-diabetes have an increased risk for macrovascular disease as well as diabetes.[58]
Often confused with pre-diabetes is the metabolic syndrome (also called syndrome X or the insulin-resistance syndrome). Metabolic syndrome, thought to be due to insulin resistance, can occur in patients with overtly normal glucose tolerance, pre-diabetes, or diabetes. It is diagnosed when a patient has at least 3 of the following 5 conditions:
- Abdominal obesity
- Elevated triglyceride level
- Low HDL-C level
- Elevated blood pressure
- Fasting glucose value greater than or equal to 100 mg/dL
Eventually, clinically apparent insulin resistance develops. Unfortunately, insulin resistance is not measured clinically, except in research settings. An elevated fasting blood glucose level is the first indication of insulin resistance, but fasting insulin levels are generally increased long before this occurs. Measurement of fasting insulin levels are not yet recommended for the diagnosis of insulin resistance. An effort to standardize insulin assays is under way and may allow for the use of fasting insulin levels to diagnose insulin resistance in the future.
Differential Diagnoses
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