The nurse is teaching a family member of an obese patient how to administer a subcutaneous U-100 insulin injection to the patient.Which instruction should be included in the teaching plan?

A) Carefully massage the site after the injection to aid absorption.
B) Draw the medication into a tuberculin syringe with a 27-gauge needle.
C) Insert the needle quickly and firmly at a 90-degree angle.
D) Rotate injection sites between the abdomen,thighs,and upper arms.

For an obese patient,the skin is pinched and the needle is inserted quickly and firmly at a 90-degree angle.Massage can damage underlying tissue.Subcutaneous U-100 insulin is given using an insulin syringe with a preattached needle of 28 to 31 gauge.Injection site rotation is no longer necessary because newer human insulins carry a lower risk for hypertrophy.Patients choose one anatomical area (e.g. ,the abdomen)and systematically rotate sites within that region-a practice that maintains consistent insulin absorption from day to day.