Body fluid leakage is a sudden, reversible capillary hyperpermeability in which plasma rapidly permeates from the blood vessels into the tissue interstices. The current diagnosis of the disease is based on the presence of predisposing factors, clinical manifestations and laboratory tests, such as the presence of factors causing SIRS or sepsis, the presence of generalized edema, decreased blood pressure and central venous pressure, weight gain, hemoconcentration, hypoproteinemia, and more severe edema after supplementation with small molecule crystalloid substances can be clinically diagnosed as CLS. so what other ancillary tests are needed? Routine blood test is the most general and basic blood test. Routine blood tests are usually done with peripheral blood, such as blood from the fingertips and earlobes. After passing through the blood cell analysis instrument, the computer reports the results and this item has become a routine for examining patients. Blood consists of two major parts, liquid and tangible cells, and routine blood tests are performed on the cellular part of the blood. Blood has three different functions of cells – red blood cells (commonly known as red blood cells), white blood cells (commonly known as white blood cells), and platelets. Diseases are determined by observing changes in number and morphological distribution. It is one of the common auxiliary tests used by doctors to diagnose the condition.