Different hospitals have different reference ranges for blood routine, which can be seen according to the reference values behind the laboratory test. Children do routine blood mainly look at the following indicators: 1, the normal value of white blood cells is (4-10) × 10 ^ 9 / L, if high suggests bacterial infection; 2, neutrophils normal for 0.5-0.7, increased or reduced for the same reasons as the white blood cell count; 3, lymphocytes normal for 0.2-0.4, high suggests a viral infection; 4, monocytes normal for 0.01-0.08 The normal range of platelets is (100~300)×10^9/L, and the decrease needs to be further checked for hematologic diseases; 7, the normal range of hemoglobin is 110-130g/L, and the decrease suggests anemia.