Educational information only. At Precursor, blood testing is requested and reviewed by a clinician and considered alongside your history and other markers, not as a stand-alone diagnosis. Testing is performed in NATA-accredited laboratories to ISO 15189 standards.

What is serum iron?

Serum iron measures the amount of iron actually circulating in your blood at the moment of the test, bound to its transport protein. Unlike ferritin, which reflects stored iron, serum iron is a snapshot that can shift with time of day and recent meals.

Why it matters

Serum iron is one component of the fuller iron studies. On its own it fluctuates too much to interpret confidently, but combined with transferrin, transferrin saturation and ferritin, it helps a clinician build an accurate picture of your iron status.

What your results can mean

Lower than optimal

A low serum iron can suggest insufficient iron, but because it varies so much, it is always read alongside the rest of the iron studies rather than alone.

Higher than optimal

A high serum iron can occur with iron overload or supplement timing, and is likewise interpreted within the full iron panel.

Reference ranges in Australia

Serum iron is reported in micromoles per litre (µmol/L), with laboratory-specific reference ranges. Because it varies through the day, read your result against your own report and, importantly, alongside ferritin and transferrin saturation.

Test your iron with Precursor

Serum iron only makes sense within the full iron studies. At Precursor it is measured as part of Full Advanced Bloods, a single clinician-reviewed blood draw covering your iron, full blood count, heart, metabolic, hormonal, kidney, liver, thyroid and nutrient markers together, giving you and your clinician a broad baseline to understand and track.