This research aimed to study the characteristics of red blood cell (RBC) and white blood cell (WBC)
and hematological values of slow loris in Thailand. Blood samples were collected from 47 slow lorises from
2014 - 2019. The distinctive characteristics of red blood cell were round shape with a width of central pallor.
The mean level of red blood cell count was 5.96 ± 0.83 x 106/μl. The characteristics of granulocytes were not
much different from that of other mammals. In the cytoplasm of granulocytes, the orange-red color of small
granules, the blue-gray color of granules, and orange-red color of granules were usually found in neutrophil,
eosinophil, and basophil, respectively. For lymphocyte and monocyte, their appearances were not different from
the lymphocyte and monocyte appearances found in other mammals. The mean level of white blood cell count
from this study was 6.50 ± 2.42 x 103/μl. Most of them were lymphocyte and neutrophil, respectively. For
basophil, it was rarely found in the blood film. Moreover, giant platelets were usually found in the blood smear.
This research revealed the hematological characteristics and preliminary hematological values of the slow
loris in Thailand which will be useful for the disease diagnosis and health check program in slow loris. Also,
this biological data can be used for further research.