Clinical intraepithelial, subcutaneous, muscular, intravenous injection site?

Subcutaneously, at the lower edge of the deltoid, at an Angle of 30 degrees, one third of the way in. Intramuscular, one quarter of the way outside the hip, 90 degrees, two-thirds of the way in. For intravenous injection, choose a thick and straight vein that is not suitable for sliding, and tie a tourniquet about five centimeters above the selected site. Angle of entry 10 to 20 degrees. The needle is inserted from the side of the vein, and then blood is returned, creeping along the vein to two-thirds of the way.

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