Patients with higher ferritin on admission were younger and more likely to be men and less likely to have atrial fibrillation, chronic lung disease, and heart failure; these patients had also higher heart and respiratory rates and lower oxygen saturation, higher creatinine and liver enzyme levels, and higher levels of inflammatory markers, including C-reactive protein, procalcitonin, and interleukin 6 (Table). The gene discussed is IL6; the disease is atrial fibrillation.