Mixed

Dual-energy X-ray absorptiometry (DXA) is the preferred criterion measure for body composition assessment because it provides a multi-compartment model including bone mineral content, offering higher accuracy than two-compartment methods.

If you have access to DXA, use it for the most accurate baseline of bone, fat, and muscle. However, recognize that other methods like BIA or skinfolds are valid for tracking changes over time if DXA is not accessible.