butterfly needle gauge
Liam Parker
Updated on May 21, 2026
23 Gauge Needles
23g needles, also known as butterflies, are used when a person’s vein is much narrower than average. It is light blue color coded. Despite the phlebotomist’s efforts to anchor the vein, the patient may be unwell or have minimal sites to choose a vein from, requiring a smaller needle.
Do butterfly needles hurt less?
Do butterfly needles hurt less? Butterfly needles can hurt less than other types of needles. This is because they can be used for veins closer to the surface of the skin and may be able to use a smaller needle.
Why should butterfly needles be avoided?
Butterflies have the highest rate of accidental needle sticks. If done incorrectly, there is an increased potential for a need for a second draw. This can cause discomfort and irritability among patients. In addition, if the needle is not removed carefully, the vein is at risk for damage.
Is a butterfly needle smaller than a regular needle?
A butterfly needle is a shorter needle with a thinner gauge, ranging from sizes 18 to 27. When measuring gauges, the higher the number, the thinner the diameter, making butterfly needles one of the thinnest needles for phlebotomists to use. Typically, 21 or 23 gauge are used for blood draws.
Which is bigger 22 or 25 gauge needle?
The higher the gauge, the smaller the diameter. For example, a 30 gauge needle has a narrower lumen than a 25 gauge needle.
What is a 26 gauge needle used for?
These are regular-walled medical point needles. They are for intramuscular, subcutaneous, and other injections and are available in a wide range of gauges and lengths. They have an oversized chrome plated luer lock hub.
What are the disadvantages of a butterfly needle?
Sometimes, butterfly needles can be difficult to insert properly. The short needle may be easily pulled back from the vein, and you may require another stick. To prevent unintended sticks, some butterfly needles have a “push-button” function that retracts the needle when the blood draw is complete.
Why is it called a butterfly needle?
The needle has plastic wings on either side of a hollow needle used to access the vein, resembling the wings of a butterfly, and hence the name. A butterfly needle is a device used to access a vein for withdrawing blood from the veins or giving medications into the vein.
What is the smallest needle to draw blood?
The smallest gauge, 25, is used primarily with pediatric patients. 1 The short needle length allows the phlebotomist to insert it at a shallow angle that can increase the ease of use.
What gauge needle is used for IV?
20 GAUGE (Pink): The 20 gauge needle is better for adult patients with smaller veins and in pediatrics. This size is ideal for IV infusion and blood infusion. You may struggle to insert a 20 gauge into tough skin due to its size.
What gauge needles are used for phlebotomy?
21-gauge needles are the most commonly used for venipuncture, while 16-gauge needles are commonly used for blood donation, as they are thick enough to allow red blood cells to pass through the needle without being broken; In addition, the thicker caliber allows more blood to be collected or delivered in a shorter
What gauge needle is used for blood transfusion?
An 18-gauge needle is standard, but a needle or catheter as small as 23-gauge can be used for transfusion if necessary. The smaller the gauge, the slower is the flow rate and the higher is the risk of clotting. Care must be taken to avoid excessive pressure and resulting hemolysis when very narrow devices are used.
What is the thinnest needle size?
The smallest, thinnest needle is the nano 4 mm, 32 gauge needle, which is about as thin as two strands of hair.
Which is bigger 18 or 20 gauge needle?
IV needles are sized by gauges, and the smaller the gauge number, the bigger the needle will be. In this article and video, I’ll discuss the three most common IV gauge needles you’ll encounter as a nurse: 18 gauge, 20 gauge, and 22 gauge.
Can you inject with a 22 gauge needle?
Intramuscular injections go directly into a muscle. 5 Muscle is deeper than skin, so the needle used for these shots must be thicker and longer. Needles with a gauge of 20 or 22 G and a length of 1 or 1.5 inches are usually best.