Our three-step screening system uses commonly used clinical and laboratory parameters to effectively identify patients who may be at high risk of HLH, conduct etiology screening early for patients who meet the diagnostic criteria for HLH, and guide standardized treatment. Therefore, this study proposes to establish a highly accurate and convenient hemophagocytic early warning system to improve the early diagnosis of patients with hemophagocytic syndrome and identify suspected HLH patients early. Etiology screening is performed on patients who meet the diagnostic criteria for HLH, high-risk predisposing factors are identified, and precise treatment is guided, thereby improving the success rate of patient treatment and improving the quality of life.

Inclusion Criteria:

Subjects must meet all of the following criteria:

1. Patients who meet the first step screening + have ≥ 3 abnormal screening indicators in the second step
2. Patients who meet the first step screening + have 2 abnormal screening indicators in the second step + patients with high-risk factors for HLH, such as history of lymphoma, EBV infection, autoimmune diseases, etc

Exclusion Criteria:

Exclusion Criteria Subjects who meet one of the following criteria will not be enrolled: 1. Patients with liver cirrhosis, liver cancer, and hepatic encephalopathy 2. Patients with trauma, hepatosplenic rupture and other organ hemorrhage 3. Patients with severe disease such as shock, sepsis, and multiple organ failure 4. Patients with DIC 5. Patients with long-term anemia 6. Patients with acute promyelocytic leukemia 7. Patients with idiopathic deafness 8. Patients who have taken hormones/immunosuppressants 72 hours before admission 9. Hereditary fibrinogen deficiency

A three-step screening process identified 80 people with suspected hemophagocytic syndrome