RAD-57 shouldn't be placed on which finger?

RAD-57 shouldn't be placed on which finger?

• A. Thumb
• B. Index finger
• C. Middle finger
• D. Ring finger

Answer: (A)

The key idea is that a RAD-57 sensor needs a stable, well-perfused site to get accurate CO-oximetry readings. The thumb is avoided because it tends to move more and has anatomy and tissue characteristics that can make the signal less reliable. The sensor fits best on fingers where perfusion is consistent and movement is limited, such as the index, middle, or ring finger. The thumb’s greater movement, potential for occlusion, and thicker soft tissue can disrupt light transmission and lead to less trustworthy readings. In practice, use a finger site with good circulation (and keep the hand warm, remove nail polish if present, and ensure a proper fit) for reliable results.

The key idea is that a RAD-57 sensor needs a stable, well-perfused site to get accurate CO-oximetry readings. The thumb is avoided because it tends to move more and has anatomy and tissue characteristics that can make the signal less reliable. The sensor fits best on fingers where perfusion is consistent and movement is limited, such as the index, middle, or ring finger. The thumb’s greater movement, potential for occlusion, and thicker soft tissue can disrupt light transmission and lead to less trustworthy readings. In practice, use a finger site with good circulation (and keep the hand warm, remove nail polish if present, and ensure a proper fit) for reliable results.