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Tips on dilating veins

Use the following tips to help cause venous dilation and make veins more accessible:

Use gravity; lower the site below the heart.
Encourage patient to tighten his fist or tense his arm muscles but remind him to relax during insertion.
Apply warm, moist heat on the extremity for 15 to 20 minutes before insertion.
Gently tap the vein.
Use a blood pressure cuff to obtain tourniquet effect.
Gently rub the extremity in a direction away from the tourniquet.