Glucose tolerance tests.

DEFINITIONS Patient (Pt) testing options for glucose testing are shown below. Protocols and interpretations for individual glucose tolerance tests follow along with information on pediatric dosing. All samples are heparinized plasma unless otherwise stated. Provider specifies what patient may eat and when collection is to occur after eating, prior to this draw. No reference range is provided. Glucose, Random Random glucose. Although flagged using fasting glucose reference range, random non-fasting glucose may exceed this range. Fasting Pt is given 75 g oral glucose (Glucola) and is drawn at 2 hours post-Glucola only. Pt is drawn fasting, then given 75 g oral glucose (Glucola). Pt is drawn at 2 hours; the 2 hour sample is interpreted per ADA guidelines; serum is acceptable. Pt is drawn fasting, then given 75 g oral glucose (Glucola). Pt is drawn at hourly intervals for the duration of the specified tolerance. This tolerance must be ordered as described in later section. Physician determines the duration of the test. GTT2HR GTT3HR GTT4HR GTT5HR • The cutoff for fasting hyperglycemia has been lowered to 99 mg/dL per ADA revised guidelines. • Random glucose values of > or = 200 mg/dL are diagnostic of Diabetes Mellitus (DM). Random glucose values of <200 mg/dL do not rule-out DM.