Antonyms for "Differential Leukocyte Counts" do not exist as it is a technical term used in medical science to describe the measurement of the different types of white blood cells present in a blood sample. The term is used to differentiate and count the various types of leukocytes, such as lymphocytes, monocytes, neutrophils, basophils, and eosinophils, to determine any abnormalities or infections in a patient. However, some antonyms for the term "differential" could be uniform, constant, or consistent. Similarly, antonyms for "leukocyte" could be non-leukocyte or erythrocyte, which refers to red blood cells.