Internal biomedical reference library.

Low-optimal ferritin levels may be associated with fatigue, impaired oxygen transport, reduced exercise tolerance, hair shedding, and altered thyroid hormone conversion despite remaining within standard laboratory ranges.

Suboptimal vitamin D levels may influence immune regulation, inflammatory balance, recovery capacity, endocrine signalling, and musculoskeletal resilience.

ApoB reflects the total number of atherogenic particles in circulation and may predict cardiovascular risk more accurately than LDL concentration alone.

Persistent low-grade inflammation as measured by hs-CRP is associated with endothelial dysfunction and accelerated atherogenesis.

Fasting insulin elevation may precede HbA1c rise by years, surfacing metabolic resilience loss before glycaemic markers shift.

HbA1c reflects average glycation across approximately 90 days, with sub-diabetic elevations associated with cardiovascular and cognitive risk.