Insulin Response to Glucose, 2 Specimens

Before the visit

Fasting required

Overnight fasting is required. High carbohydrate diet for 3 days before test. Patient NPO after midnight; glucose solution 1.75 g/kg body weight (maximum dose 75 g) orally administered after collection of fasting specimen.

Specimen

Specimen

1 mL serum per specimen

Minimum volume

0.5 mL per specimen

Container

Transport tube(s)

Temperature

Refrigerated (cold packs)

Draw fasting specimen. Collect 1 mL serum for each timed specimen post glucose dose. All tubes must be clearly marked with time drawn. Submit all tubes with one test requisition. Reference ranges available: Fasting and 30, 60, 90, 120, 150, 180, 240 and 300 minutes post glucose. Unable to add INSULIN testing unless sample was submitted frozen.

Billing

CPT 83525