Leukocytes 4 + suggest strong positive, indicating the presence of infection in the organism, and the infection is more serious, it is recommended to consult a doctor in a timely manner, improve the relevant examination, according to the results of the examination for treatment. Urine routine examination may indicate urinary tract infection, common diseases include pyelonephritis, glomerulonephritis, cystitis, vaginitis, prostatitis, etc., the patient often manifests frequent urination, urinary urgency, urinary pain. The presence of cerebrospinal fluid examination may suggest purulent meningitis, which is usually manifested as meningeal irritation sign, cervical ankylosis, König’s sign, and Brookinsky’s sign. The presence of routine stool examination suggests the presence of bacterial infection in the gastrointestinal tract, which is common in gastroenteritis, bacterial food poisoning, etc., and patients may have abdominal pain, diarrhea, and vomiting.