Complete Blood Count Parameters and Bone Health: Clinical and Experimental Evidence

Osteoporotic fractures pose a significant burden in aging populations, yet current assessment strategies may overlook systemic factors influencing bone health. Emerging evidence suggests that complete blood count (CBC) parameters, including red blood cell indices, white blood cell (WBC) counts and subtypes, and platelet counts, are associated with skeletal fragility and fracture risk. Anemia has been consistently linked to reduced bone mineral density and increased fracture susceptibility, potentially due to impaired oxygen delivery and osteoblast dysfunction. Elevated red cell distribution width may reflect oxidative stress and has been associated with bone loss. Inflammatory markers such as high WBC count and neutrophil-to-lymphocyte ratio are implicated in enhanced osteoclast activity, while platelet abnormalities may influence bone remodeling and fracture healing. These associations suggest that CBC-derived markers could serve as accessible and cost-effective indicators to support osteoporosis evaluation. However, important limitations remain, including undefined clinical thresholds, limited longitudinal evidence, and uncertain causality. Further research is needed to clarify underlying mechanisms and determine whether correcting hematological abnormalities can improve skeletal outcomes. A cautious, evidence-based approach is warranted to define the role of CBC parameters in the clinical assessment of bone health.