Model for Predicting Risk of Foot Ulceration in a Diabetic (Seattle Risk Score)

Parameters:

(1) hemoglobin A1C in percent (as a whole number)

(2) neuropathy

(3) vision

(4) tinea pedis

(5) onychomycosis

(6) past history of foot ulcer (either side)

(7) past history of lower limb amputation (either side)

where:

• The score uses hemoglobin A1C results over the entire range (normal and elevated). It would be interesting to see if the degree of elevation above normal was used.

total score =

= (0.0975 * (percent hemoglobin A1C)) + (0.7101 * (points for neuropathy)) + (0.3888 * (points for vision)) - (0.3206 * (points for tinea pedis)) + (0.4579 * (points for onychomycosis)) + (0.7784 * (points for history of foot ulcer)) + (0.943 * (points for amputation))

Interpretation:

• minimum score: varies with hemoglobin A1C, but close to 0

• maximum score: around 5.1

• The higher the score the greater the risk of diabetic foot ulcer.