<![CDATA[Background: Haliaeetus leucogaster, or the white-bellied sea eagle, is one of the largest raptors in Indonesia and plays a crucial role in maintaining ecological balance. Hematological evaluation is essential for assessing health and release suitability after rehabilitation; however, reference data for this species, especially from Indonesia, remain limited. Purpose: This study aimed to support clinical assessments and conservation strategies by, providing descriptive hematological data for H. leucogaster undergoing rehabilitation at the Bali Wildlife Rescue Centre, Indonesia. Method: Blood samples from five healthy H. leucogaster were analyzed at the Udayana University Veterinary Teaching Hospital. Measurements included erythrocyte and leukocyte counts, hematocrit, hemoglobin, erythrocyte indices (MCV, MCH, MCHC), and differential leukocyte counts. Morphology was documented using Optilab Viewer 2.2. Morphometry was measured using Image Raster 3. Data are presented as mean ± SD and range. Results: Mean erythrocyte count was 2.95±0.41×106/µL, hematocrit 48.80±5.60%, hemoglobin 10.54±1.29 g/dL, MCV 171.06±36.62 fL, MCH 37.41±10.14 pg, and MCHC 21.84±3.38 g/dL. Mean leukocyte count was 13.69±4.31×103/µL, with heterophil predominance (56.8±3.42%). Erythrocyte and leukocyte morphology and morphometry were consistent with normal avian raptor references. Monocytes were the largest leukocytes (13.09±0.86×12.19±1.08 µm, perimeter 41.13±2.33 µm) and basophils were the smallest (6.10±0.76×5.46±0.68 µm, perimeter 19.31±2.60 µm). Conclusion: Hematological values for H. leucogaster at the Bali Wildlife Rescue Centre fall within published references and provide preliminary data for individuals undergoing rehabilitation in Indonesia. These findings may assist veterinarians and rehabilitators in evaluating health status during rehabilitation and prior to release.]]>
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