Laser has many applications in the medical field like in dermatology, dental, surgery or blood components analyzer. Human blood consists of many components like plasma, White Blood Cells (WBC) hemoglobin proteins. The disorder of these components from their standard ranges will cause some blood diseases. The deviation of the blood hemoglobin concentration from the normal ranges have been studied, in this work the analysis based on the amount of the laser that being absorbed by the blood sample, according to these analyses and by using the medical specifications of the blood diseases, the parameters of the blood diseases will represents the database to the blood diagnoses fuzzy classifier. The inputs have been selected to the classifier which was being built in MATLAB package and the outputs results were getting according to the medical experience that must performed by the system.