Investigations play a very important role in medical diagnosis. Laboratory results are estimated to affect 60-70 per cent of the most important decisions in patient care. Timely collection of sample and delivery of accurate test results are, therefore, important quality indicators of performance of any laboratory. Lab procedures are divided into three phases: pre-analytical, analytical, and post-analytical. This case deals with the pre- analytical procedure of the Lab Department in Mahanagar Hospital. Managing this complicated activity is one of the most challenging phases in Lab analysis. The case gives a detailed account of a regular day of a phlebotomist and steps that are undertaken to minimize lab errors.