Iron
Transferrin saturation
The share of your iron-carrying capacity that actually has iron loaded onto it.
Unit %Typical adult range 20–50 %
What it is
The share of your iron-carrying capacity that actually has iron loaded onto it.
Why it matters
With ferritin it separates true iron deficiency from the low iron that inflammation causes, and a high value can point toward iron overload.
Reading the number
Below about 20 percent supports iron deficiency. Morning samples read higher than afternoon ones, so compare like with like.
What moves it
time of dayrecent mealiron supplementsinflammation
Read alongside
When to raise it
Worth discussing a value that is persistently low, or persistently high.
Also known as
On a report in another language.
A lab report names this analyte in its own language. Vitals Vault recognises each of these and files them all under Transferrin saturation.
Saturação da TransferrinaISTÍndice de Saturação da TransferrinaTransferrinsättigungTSAT
Catalog entry last updated 2026-08-27. Browse all 165 metrics.