A \"21 gauge 1 inch needle\" (having a dead space of 50 microliters) attached to

Question

A "21 gauge 1 inch needle" (having a dead space of 50 microliters) attached to a one milliliter U-100 syringe was used by a nurse to first draw 20 units of regular insulin U-100 and then to avoid multiple injections was use again to draw up 30 units of a long acting Lantus insulin suspension U-100 by pulling back the plunger further until the 50 unit marking on the U-100 syringe. The syringe was then gently rotated to mix the two insulin preparations. After mixing the nurse injected the 50 units of mixed insulin preparations into the patient. Based on what the nurse did by mixing the two insulins in one syringe how many units of U-100 regular insulin was actually administered to the patient.   

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Explanation / Answer

When administering insulin to the patient it should match with the syringe. U 100 regular insulin can be administered using a 1 ml syringe.When regular insulin are given to patients with long acting ones they should be thoroughly mixed. ADA recommends that the regular insulin should be first drawn into the syringe and then the long acting LANTUS insulin. Care should be taken to see that the dosage is not changed.

Total Daily Insulin Requirement (in units of insulin) = 0.55 X Total Weight in Kilograms

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