In the antecubital winged method, what gauge needle is used?

• A. 22 gauge
• B. 21 gauge
• C. 24 gauge
• D. 23 gauge

Answer: (B)

When drawing blood with a butterfly (winged) needle in the antecubital area, the 21-gauge needle is the standard choice. The gauge indicates the needle’s bore: a 21-gauge needle has a lumen wide enough to allow smooth, rapid blood flow into multiple collection tubes without excessive trauma to the vein. This helps complete draws efficiently and reduces the risk of hemolysis or vein irritation that can occur with slower, narrower needles.

Smaller gauges, like 23 or 24, have even narrower lumens, which slows flow and can make the draw longer or more challenging, especially if multiple tubes are needed. A larger gauge, such as 22, could work, but 21 gauge is commonly preferred because it consistently balances speed and comfort for routine adult venipuncture with a winged needle.

In summary, 21 gauge provides reliable flow for standard adult blood draws using the antecubital winged method.