Table 1.

The American College of Rheumatology/European League Against Rheumatism Criteria of the Classification of Systemic Sclerosis.

Criteria	Sub-criteria	Score
Skin thickening of fingers of both hands extending proximal to the metacarpolphalangeal (MCP) joints		9
Skin thickening of fingers only (only count higher score)	- Puffy fingers - Sclerodactyly of the fingers (distal to the MCP joints but proximal to the proximal interphalangeal (PIP) joints	2 4
Fingertip lesions (only count higher score)	- Digital tip ulcers - Fingertip pitting scars	2 3
Telangectasia		2
Abnormal nailfold capillaries		2
Lung involvement (maximum score of 2)	- PAH - ILD	2 2
RP		3
SSc-associated autoantibodies (anti-centromere, anti-topoisomerase I (anti-Scl-70), anti-RNA polymerase III)		3

The total score is calculated by adding the highest score in each category. Those with a score of at least 9 are classified as having SSc.

Modified from [6].