A neutrophil count of 77% is high and may indicate abnormalities such as infection, toxicity, and tumors. Neutrophils are mainly derived from bone marrow and have phagocytic as well as bactericidal properties. The absolute value of neutrophils is (1.80-6.30) × 10^9/L, and their proportion in white blood cells is 40%-75%. Therefore, 77% neutrophils is high. High neutrophils may indicate acute or purulent infections such as boils, carbuncles, abscesses, pneumonia, appendicitis, sepsis, scarlet fever, etc. In addition, acidosis, uremia, and mercury toxicity can cause an increase in neutrophils. Tissue injury, malignant tumors, acute hemorrhage, acute hemolysis, etc. may also cause their abnormal increase. However, it is difficult to judge which disease is caused by neutrophil ratio alone, and it needs to be judged according to the patient’s own clinical symptoms as well as other auxiliary examinations, and it is recommended to consult a doctor in time.