What does it mean to have a low vitamin d and low red blood count?

Ca+2, Bones & Anemia: Vit d3, not d per-se, required for calcium absorption & storing in our bones. 99.9% of ca+2 in bones. Also crucial for muscle contraction, /strength, clotting, nerve conduction, etc. Low vit d3 means lower ca+2 absorption rates over time with associated problems. Rbcs with hemoglobin: the red color of blood, carry oxygen; when low (all degrees), called anemia, multiple possible reasons for low.