Duke Treadmill Score is a prognostic tool used to evaluate the patient with the suspected coronary heart diseases

Duke score is calculated as follows:

• Duke Score = Time in minutes - (5 × ST wave deviation in mm) - (4 × Treadmill angina index)

Treadmill angina index is

0 - No angina

1 - Non-limiting angina

2 - Test stopped due to angina

The score typically ranges from -25 to +15.

>=+5 corresponds to Low risk

-10 to +4 corresponds to moderate-risk and

<=-11 correspond to High risk

References:

1. Shaw LJ, Peterson ED, Shaw LK, et al. Use of a Prognostic Treadmill Score in Identifying Diagnostic Coronary Disease Subgroups. Circulation 1998; 98:1622-30
2. Mark DB, Shaw L, Harell FE, et al. Prognostic value of a treadmill exercise score in outpatients with suspected coronary artery disease. N Engl J Med 1991; 325:849-53.