What is the angle of needle entry for hypodermic injections?

Injection, subcutaneous injection, intramuscular injection, intravenous injection. The angle of each injection method is that in the intradermal injection method, the needle is inclined upward and pierced into the skin at an angle of 5° to the skin. The intramuscular injection method is to place the needle at a 90° angle to the injection site and quickly pierce the muscle. Intravenous injection method is that the needle is inclined upward and forms an angle of 15°-30° with the skin, and is pierced under the skin from the top or side of the vein, and then pierced into the vein along the direction of the vein. In the hypodermic injection method, the needle is inclined to the upper skin at an angle of 30°-40°, and quickly penetrates the skin, that is, the angle is 30°-40° with the skin.

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