When assessing protective sensation with Semmes-Weinstein monofilaments, which equipment is MOST desirable?

• A. Cotton ball
• B. Semmes-Weinstein monofilaments
• C. Pin with a sharp and blunt end
• D. Test tubes filled with warm and cool water

Answer: (B)

Assessing protective sensation requires a standardized, measurable stimulus. Semmes-Weinstein monofilaments provide a known force when bent, giving a repeatable threshold for touch-pressure perception. This standardization lets you determine whether protective sensation is present or diminished, which is crucial for identifying ulcer risk in patients with neuropathy. The typical test uses a 10-gram filament at multiple plantar sites to see if the patient can feel it; if not, protective sensation is lost and the patient is at higher risk for ulceration. Other options lack this standardization: a cotton ball offers qualitative, nonquantified touch; a pin varies in pain and force and isn’t standardized; and warm/cool water tests measure temperature sensation rather than pressure protection.