The issue first came to light last September, when Cardinal Health, Inc. sent a letter to healthcare providers and consumers warning that their Monoject U-100 1 mL Insulin Syringe Luer-Lock with ...

of insulin into a 10 mL syringe, instead of 1 mL (100 units) in an insulin syringe, and then added that amount to a 100 mL bag of 0.9% sodium chloride. This resulted in a 10 units/mL insulin infusion.

a The following dosing formulas may also be used: dose (actual units) × 0.2 = unit markings in a U-100 insulin syringe, dose (actual units) × 0.002 = volume (mL) in a tuberculin syringe.