Proinsulin Test for Insulin Resistance

Conditions and notices

• 8-12 hours fasting
• Fasting: Strictly required for 8-12 hours before sample collection (water only).
• Timing of the sample: It should be taken during an episode of hypoglycemia (if possible) or after a prolonged fast if an insulinoma is suspected.
• Accompanying tests: Usually requested along with measuring insulin, C-Peptide, and glucose in the same sample.
• Avoiding side effects: Stop any medications that affect blood sugar before the test, as instructed by your doctor.