The main purpose of this textbook is to guide the practitioner in the use and interpretation of routine laboratory results in the care of children. Most of the diseases are discussed with an approach that is most likely to disclose the nature of the disorder. The subjects discussed include the red blood cells, hemoglobin, blood grouping, transfusions, erythroblastosis, leukocytes, blood clotting, hemorrhagic disorders, disturbances of the spleen, bone marrow, and urine, the kidney and its diseases, spinal fluid, the liver and its diseases, the organic and inorganic constituents of the blood, vitamins and their blood levels, the gastrointestinal tract and its parasites, the endocrine system, infectious diseases, including viral and systemic protozoan infections and arthropod infestations, chemotherapy, obscure generalized diseases, and poisonings. The book presents much specific detail, with special emphasis on variations in laboratory results that are physiological in children. There is a complete index with cross references, and