Needles of 16 to 18 gauge and 1 to 1.5 inches long are adequate for intramuscular injections.
A 20 gauge 1.5 inch needle is standard for thinner drugs, an 18 gauge needle is needed for thicker drugs such as penicillin.
Standard microchips have in the past required a 12 gauge needle to implant, but the new Mini Chip™ is delivered through a slim sharp 15 gauge needle.
Needle length is usually 1"–1½", 22–25 gauge, but a longer or shorter needle may be needed depending on the patient's weight. Note: An alternate site for IM injection in adults is the anterolateral thigh muscle.
Knitting needle sizes: 1-3 The sock sneaks up on all us knitters at some point. Most socks are knit using a size 1 or 2 needle, but you can also find sock patterns that are designed for heavier non-sock yarns. In addition to socks, you can knit up beautiful shawls using sock-weight yarn and these small needles.
If you're knitting a hat, a 16″ (40 cm) circular needle usually works well. If it's a tiny baby hat, you might prefer a 12″ (30 cm) circular, instead.
Concerning the needle size for thyroid fine needle aspiration cytology (FNAC), 25-27-gauge needles are generally used in Western countries. However, in Japan, the use of larger needles (21-22-gauge needles) is common.
The standard size needles to use for canine injections are 21 to 23-gauge needle, 1 to 1.5 inches long.
Longer needles (½ inch or longer) are commonly used for intramuscular injections, while shorter (shorter than ½ inch) needles are more often used for intravenous injections.
Hypodermic needles are in widespread use, but patients are unhappy with the pain, anxiety, and difficulty of using them. To increase patient acceptance, smaller needle diameters and lower insertion forces have been shown to reduce the frequency of painful injections.
Needle length: If you have a small dog with a low dose of insulin, the shorter needle length (5/16” (8mm) or a 15/64” 6mm) is probably best for you. If you have a large breed dog with a larger dose, you may need the longer needles (1/2” or 12.7mm) to properly administer your insulin.
They use hair-thin, ultra-lubricated needles, as tiny as possible. For thousands of practices, 25- to 27-gauge needles are the perfect size for vaccines. Size also matters when it comes to the amount of fluid used in the vaccine.