TCA solution, also known as Trichloroacetic acid solution, is a commonly used chemical reagent in laboratory settings for various applications such as protein precipitation, DNA extraction, and cell fixation. 

The TCA solution at 1.2 MOL./L concentration offers a potent and effective means of concentrating and precipitating proteins from urine samples. It enables researchers and medical professionals to analyze and measure the levels of proteins present, aiding in the diagnosis and monitoring of various kidney and urinary tract disorders, as well as other medical conditions that may affect protein excretion in urine.