Barrel size (syringe fluid volume) Insulin units Needle length Needle gauge 0.3 mL 30 units of insulin 3/16 inch (5 mm) 28 0.5 mL 30 to 50 units of insulin 5/16 inch (8 mm) 29, 30 The correct ...

Commonly used along with longer-acting insulin. Rapid-acting inhaled 10 to 15 min 30 min 3 hours Given 10 ... Insulin is most commonly administered through a syringe, insulin pen, or insulin ...