a biochemistry analyzer includes , an attenuated total reflection prism , a sample cell disposed on a surface of the prism , a sample supplier , a device for disposing more objective molecules in the liquid sample to a near portion of the sample which is near the surface of the prism , an infrared light source for generating an infrared light which is transmitted to the attenuated total reflection prism , a detector for detecting the infrared light which is reflected from the prism after the far portion of the sample is solidified , and a computer for calculating signals from the detector . as the objective molecules are gathered near the prism , accuracy of the biochemistry analyzer becomes higher .