InAlyzer can analyze Bone Mineral Density and Body Composition (BMC, FAT, LEAN) of alive lab animals in units of 0.001g with simple anesthesia without dissection. Serial assessment is possible for each entity of alive lab animals that can save the time, labor, and cost efficiently. System works on DXA (Dual energy X-ray Absorptiometry). Moreover, ‘InAlyzer’ has researcher be safe from the radiation by blocking off the outside exposure of the radiation with internal protection structure. ‘InAlyzer’ provides the effectiveness, accuracy, and successful qualification in the preclinical phase.