Complete Blood Count (CBC): This test measures the levels of different blood cells and can identify which cell types are deficient. Bone Marrow Biopsy: This procedure can determine the cause of cytopenia by assessing the health and makeup of bone marrow cells. Nutritional Assessments: Blood tests to check levels of essential vitamins and minerals such as vitamin B12, folate, and iron. Imaging Studies: Techniques like CT scans may be used to identify any masses or abnormalities that could be affecting bone marrow function.