How deep is the hypodermic needle injection

Hypodermic needle injection generally uses a 1ml syringe, the depth is 1/3-2/3 of the needle can be inserted. The selected position is generally at the lower edge of the deltoid muscle, which is the three transverse fingers below the acromion, within the range of five centimeters from the umbilicus, or the outer thigh. If the puncture is too shallow, the drug may be injected into the skin, if the puncture is too deep, the drug may be injected into the muscle. In addition, when choosing a location, pay attention to whether there are obvious blood vessels under the skin, and at the same time avoid induration, redness and scars.

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