Glucose, 2HR Challenge
Green top (lithium heparin) tube
Mon-Fri, call for appointment
Timed endpoint reaction using hexokinase
Outpatients must be scheduled in advance. Patients should eat their usual diet for 3-5 days and fast 8 hours prior to testing. A fasting level will be drawn and must be < 125 mg/dL (glucometer) before proceeding. Glucose dose will be orally administered and blood will be collected at the 2 hour interval post glucose ingestion.
Criteria for Diagnosis of Diabetes(2HR Challenge):
Fasting specimen (no caloric intake for at least 8 hours).
<100 mg/dl Normal
100-125 mg/dl Increased Risk for Diabetes
>125 mg/dl Diagnostic for Diabetes
2 Hour Specimen (post glucose administration).
<=139 mg/dl Normal
140-199 mg/dl Increased Risk for Diabetes
>=200 mg/dl Diagnostic for Diabetes