Leukocyte esterase is a specific enzyme in neutrophils that can be used as a marker of mature neutrophils in the body. A weakly positive leukocyte esterase indicates the presence of a small number of neutrophils in the test specimen, which generally indicates the possible presence of a bacterial infection, or what is known as inflammation.
Leukocytes are a general term for a group of cells in the blood, including neutrophils, eosinophils, basophils, lymphocytes, etc. However, leukocyte esterase is present only in neutrophils, and the leukocyte esterase test is used clinically to detect the presence of neutrophils.
It is important to note that a positive leukocyte esterase test in human urine or secretions, as a diagnostic aid, only indicates the presence of neutrophils in the test specimen, but it does not clarify whether there is a bacterial infection and which pathogenic bacteria are present, and requires a comprehensive diagnosis combined with the patient’s medical history and other laboratory indicators. There are many causes of elevated neutrophil count in the body, including acute infections caused by various bacteria such as pneumonia and appendicitis, serious tissue injuries such as major surgery and myocardial infarction, as well as leukemia and malignant tumors, which can lead to neutrophilia and leukocyte esterase positivity.
In summary, a weakly positive leukocyte esterase indicates the presence of neutrophils in the test specimen, suggesting a possible bacterial infection, but the patient needs to be diagnosed in conjunction with the medical history and other relevant laboratory tests.