For fingerstick, which fingers are preferred?

• A. Thumb on the dominant hand
• B. Index finger on the nondominant hand
• C. 3rd or 4th finger on the dominant hand
• D. Pinky finger on either hand

Answer: (C)

When doing a fingerstick, you want a finger with good blood flow and a sturdy, easy-to-puncture fingertip. The middle (third) and ring (fourth) fingers on the hand you use to perform the test fit that need: they have a generous fingertip pad and reliable capillary supply, and they are easy to stabilize during the puncture and drop collection. Using these digits on your dominant hand gives you fine motor control and steadiness, which helps you obtain a clean sample with minimal discomfort.

The thumb tends to have a thicker pad and is frequently used for gripping, which can make precise puncturing harder. The index finger often has more calluses and variable perfusion, and the pinky is smaller with less reliable blood flow, making it less ideal for a consistent, adequate sample.