Editing Subcutaneous administration (section)

===Equipment===
The [[Birmingham gauge#Sizes of hypodermic needles|gauge]] of the needle used can range from 25 gauge to 27 gauge, while the length can vary between {{frac|1|2}}-inch to {{frac|5|8}}-inch for injections using a syringe and needle.<ref name=Taylor/>{{rp|722}} For subcutaneous injections delivered using devices such as [[injector pen]]s, the needle used may be as thin as 34 gauge (commonly 30–32 gauge), and as short as 3.5&nbsp;mm (commonly 3.5&nbsp;mm to 5&nbsp;mm).<ref name="MD2019">{{cite journal | vauthors = Leonardi L, Viganò M, Nicolucci A | title = Penetration force and cannula sliding profiles of different pen needles: the PICASSO study | journal = Medical Devices: Evidence and Research | volume = 12 | pages = 311–317 | date = 28 August 2019 | pmid = 31695523 | pmc = 6717876 | doi = 10.2147/MDER.S218983 | doi-access = free }}</ref> Subcutaneous injections can also be delivered via a pump system which uses a cannula inserted under the skin. The specific needle size/length, as well as appropriateness of a device such as a pen or pump, is based on the characteristics of a person's skin layers.<ref name=Taylor />{{rp|722–724}}