The calculator in question is the ACR/EULAR (American College of Rheumatology/European League Against Rheumatism) classification criteria for Takayasu arteritis. This scoring system is used in the diagnosis and classification of Takayasu arteritis, a rare type of vasculitis that affects large arteries, particularly the aorta and its main branches. 

The ACR/EULAR criteria for Takayasu arteritis are applied to patients who are suspected of having this condition, typically presenting with symptoms such as fatigue, weight loss, fever, night sweats, joint pain, and muscle pain. The criteria include age at disease onset, claudication of extremities, decreased brachial artery pulse, blood pressure difference >10mmHg, bruit over subclavian arteries or aorta, and arteriogram abnormalities.

The clinical utility of this calculator is to aid in the diagnosis of Takayasu arteritis, which can be challenging due to its rarity and the nonspecific nature of its symptoms. The ACR/EULAR criteria provide a standardized approach to diagnosis, helping to ensure that patients receive appropriate treatment and care.

There are no specific exclusion criteria for the use of the ACR/EULAR criteria for Takayasu arteritis. However, it should

ACR/EULAR classification criteria for Takayasu arteritis

# Criteria
 # Entry criteria
A. Age <= 60 years at the time of diagnosis (+30)
B. Evidence of vasculitis on imaging (+30)
# Clinical criteria
C. Female gender (+1)
D. Angina or ischemic cardiac pain (+2)
E. Arm or leg claudication (+2)
F. Vascular bruit (+2)
G. Reduced pulse in the upper extremity (+2)
H. Carotid artery abnormality (+2)
I. Systolic blood pressure difference in arms >= 20 mmHg (+1)
## Affected arterial territories
J. 1 (+1)
K. 2 (+2)
L. >= 3 (+3)
# Additional imaging criteria
M. Symmetric involvement of paired arteries (+1)
N. Abdominal aorta involvement with renal or mesenteric involvement (+3)

# Conditions
- score >= 65
- true
- score == 0