How Many Degrees Do You Add When You Take A Temperature Under The Arm?

How Many Degrees Do You Add When You Take A Temperature Under The Arm? An ear (tympanic) temperature is 0.5°F (0.3°C) to 1°F (0.6°C) higher than an oral temperature. An armpit (axillary) temperature is usually 0.5°F (0.3°C) to 1°F (0.6°C) lower than an oral temperature. Is 99.4 under the arm a fever? Symptoms to watch