27gauge

27 gauge, denoted 27G, is a size designation used primarily for fine hypodermic needles. In needle gauge systems, a higher gauge number indicates a thinner needle. Compared with mid-range gauges such as 23G or 25G, a 27G needle is finer, though it is thicker than the very fine 29G–31G needles used for certain insulin or cosmetic applications. The 27G size is commonly chosen when a small puncture and reduced tissue trauma are desired, such as for intradermal tests, subcutaneous injections with small volumes, and some pediatric injections. It can also be used for fine-needle aspiration procedures depending on the clinician’s preference and the equipment available.

Manufacture and use: 27G needles are typically made of stainless steel with a bevel-cut tip and are supplied sterile for single use. They are designed to fit standard syringes and come in various lengths and hub configurations. When selecting a needle, clinicians balance factors such as flow rate, medication viscosity, injection depth, and patient comfort.

Other gauge systems: The term 27 gauge also appears in other fields, but gauge numbers are not interchangeable across domains. In electronics, wire gauge scales like AWG use different reference diameters. Always refer to the specific standard for the domain in question.