ABN Requirement: No CPT Code: IROGTT, 2 Samples: 83525 (x2) IROGTT, 3 Samples: 83525 (x3) Each additional sample: 83525 Order Code: IROGTT, 3 Samples (Fasting, 1 hour, 2 hour): C559 IROGTT, 2 Samples (Fasting, 1 hour): C558 IROGTT, 2 samples (Fasting, 2 hour): 1344 IROGTT, Additional Insulin 1: 1419 IROGTT, Additional Insulin 2: 1420 Specimen: Serum Volume: 1.0 mL (per more »