Systemic Sclerosis Severity Index

Quantify overall disease severity in systemic sclerosis using the Systemic Sclerosis Severity Index (SSI), integrating organ involvement across skin, vascular, pulmonary, cardiac, renal, and GI domains.

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Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.
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How It Works

Quantify overall disease severity in systemic sclerosis using the Systemic Sclerosis Severity Index (SSI), integrating organ involvement across skin, vascular, pulmonary, cardiac, renal, and GI domains

Each component has a specific meaning:

  • Systemic Sclerosis Severity Index — The systemic sclerosis severity index recorded for the scenario being assessed.
  • Integrating organ involvement across skin — The integrating organ involvement across skin recorded for the scenario being assessed.
  • Vascular — The vascular recorded for the scenario being assessed.
  • Pulmonary — The pulmonary recorded for the scenario being assessed.
  • Cardiac — The cardiac recorded for the scenario being assessed.
  • Renal — The renal recorded for the scenario being assessed.

Note: Interpret the ssi result against the thresholds and context described above.

How to Use

Enter the Systemic Sclerosis Severity Index, integrating organ involvement across skin, vascular, pulmonary, cardiac, renal for the scenario you are assessing. Quantify overall disease severity in systemic sclerosis using the Systemic Sclerosis Severity Index (SSI), integrating organ involvement across skin, vascular, pulmonary, cardiac, renal, and GI domains. Use the ssi result to inform your calculation.

Frequently Asked Questions