Macrophage Activation Syndrome (MAS) Criteria Calculator

Apply 2016 ACR/EULAR/PRINTO classification criteria for MAS complicating systemic juvenile idiopathic arthritis using ferritin, platelet count, AST, triglycerides, and fibrinogen.

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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

Apply 2016 ACR/EULAR/PRINTO classification criteria for MAS complicating systemic juvenile idiopathic arthritis using ferritin, platelet count, AST, triglycerides, and fibrinogen

Each component has a specific meaning:

  • Ferritin — The ferritin recorded for the scenario being assessed.
  • Platelet count — The platelet count recorded for the scenario being assessed.
  • AST — The ast recorded for the scenario being assessed.
  • Triglycerides — The triglycerides recorded for the scenario being assessed.
  • Fibrinogen — The fibrinogen recorded for the scenario being assessed.

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

How to Use

Enter the ferritin, platelet count, AST, triglycerides, fibrinogen for the scenario you are assessing. Apply 2016 ACR/EULAR/PRINTO classification criteria for MAS complicating systemic juvenile idiopathic arthritis using ferritin, platelet count, AST, triglycerides, and fibrinogen. Use the mas criteria result to inform your calculation.

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