38.3°C is a moderate fever, not a high fever. There are three main methods of detecting body temperature, namely: detecting the axillary temperature, oral temperature, anal temperature. These three detection methods detect the temperature anal temperature is greater than the oral temperature, oral temperature is greater than the axillary temperature, life is most commonly used to detect the axillary temperature, the axillary temperature between 36-37 ° C, 37.3-38 ° C between low fever. 38-39 ° C between moderate heat, 39-41 ° C between high fever, greater than 41 ° C for ultra-high fever.