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2. French catheter scale - Wikipedia

   en.wikipedia.org/wiki/French_catheter_scale

   However, the term gauge, abbreviated G or ga, typically refers to the Birmingham gauge for hypodermic needles. [1] The French scale measures and is proportional to the outer diameter of a catheter, with 1 French (Fr) defined as 1 ⁄ 3 millimeter, making the relationship: 1 mm = 3 Fr.

3. Birmingham gauge - Wikipedia

   en.wikipedia.org/wiki/Birmingham_gauge

   The Birmingham gauge is also known as the Stubs Iron Wire Gauge or Birmingham Wire Gauge and is distinct from the Stubs Steel Wire Gauge and the British Standard Wire Gauge. It is commonly referred to simply as gauge (abbreviated as G ), [ 3 ] but this should not be confused with the French gauge , a separate system used for measuring the outer ...

4. Hypodermic needle - Wikipedia

   en.wikipedia.org/wiki/Hypodermic_needle

   Various needle lengths are available for any given gauge. Needles in common medical use range from 7 gauge (the largest) to 34 (the smallest). 21-gauge needles are most commonly used for drawing blood for testing purposes, and 16- or 17-gauge needles are most commonly used for blood donation, as the larger luminal cross-sectional area results ...

5. Subcutaneous administration - Wikipedia

   en.wikipedia.org/wiki/Subcutaneous_administration

   The gauge of the needle used can range from 25 gauge to 27 gauge, while the length can vary between 1 ⁄ 2-inch to 5 ⁄ 8-inch for injections using a syringe and needle. [ 3 ] : 722 For subcutaneous injections delivered using devices such as injector pens , the needle used may be as thin as 34 gauge (commonly 30–32 gauge), and as short as 3 ...

6. Injector pen - Wikipedia

   en.wikipedia.org/wiki/Injector_pen

   They are available in multiple lengths and gauge of needle, including 3.5mm, 4mm, 5mm, and 8mm lengths, and 31 through 34 gauge. [8] Over time, needles have also had bevels designed which decrease the force required to penetrate the skin, which decreases the pain associated with injection and may increase the acceptability of self-injection. [8]

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