A measurement indication method and an apparatus to indicate difference between a measured result taken by a medical measurement instrument and a normal digital value according to medical theory. The medical measurement instrument includes at least a measurement element, a power supply, at least one processing unit and the apparatus to implement the measurement indication method. The apparatus includes a plurality of indication lamps capable of emitting light of three or more colors. The number and lighting color of the indication lamps can be changed sequentially according to the difference of the measured digital value and a normal digital value range. Thereby users can easily determine the difference between the measured result and the normal value. And the measured value can be indicated in graphics.