A medical laboratory is diagnostic. The information the lab finds and reports to the doctor will help the doctor to diagnose and treat the patient's problem. Any drainage from your body can be studied in a Microbiology Testing labs in Chennai . Specially trained, educated, and certified lab techs test the drainage to see what kind of bacteria is causing the infection. Once the doctor has this information, proper treatment can be started. Nasal, throat, eye, ear, genital, urine, fecal, wounds, blood, extracted spinal fluid - all these sources can be cultured and grown and studied in the micro department. A fun place to work! GRAM STAIN. A little bit of the infected sample is rolled in a thin layer onto a small glass slide and sent to the lab. There, it is stained with a special stain called the Gram stain. The lab tech looks at the slide under the microscope, looking for shape and color of any bacteria found. This can sometimes be tricky because elongated cocci can look like rods, ...