What is the difference between subcutaneous injection and skin test, I mean depth?

Intradermal injection: Use a normal syringe to insert the needle close to the skin, push the medicine after entering the skin, and punch a small white bag with a diameter of 5-7 mm on the skin (that is, to hold the skin up). Intradermal injection: With a general syringe, the needle is inserted at an angle of 35 degrees to 45 degrees, and the injection is carried out under the skin, and there is generally no small packet. We are now injecting with an insulin pen, and the tip of the pen itself just goes under the skin, so it should be a good injection.

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