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Iron Kinetics Markers – Lab Values Explained

Iron kinetics markers are laboratory values that reflect the metabolism, transport, and storage of iron in the body. They are essential for diagnosing iron deficiency or iron overload.

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Iron kinetics markers are laboratory values that reflect the metabolism, transport, and storage of iron in the body. They are essential for diagnosing iron deficiency or iron overload.

What are Iron Kinetics Markers?

Iron kinetics markers are a group of laboratory parameters that describe the metabolism, transport, and storage of iron in the human body. They provide information about how much iron is available in the blood, how it is bound and transported, and how well the body's iron stores are filled. These markers are essential for diagnosing iron deficiency, iron deficiency anaemia, and conditions involving iron overload such as haemochromatosis.

The Most Important Iron Kinetics Markers

Serum Iron

Serum iron measures the amount of iron freely circulating in the blood serum. In adults, normal values typically range from 60 to 170 µg/dl. A low value may indicate iron deficiency, while an elevated value can suggest iron overload or liver cell damage.

Transferrin

Transferrin is the main transport protein for iron in the blood. It binds iron and delivers it to cells that require it. In cases of iron deficiency, transferrin levels rise as the body provides more transport capacity. In chronic diseases or iron overload, transferrin is often reduced.

Transferrin Saturation

Transferrin saturation indicates what percentage of the available transferrin is loaded with iron. It is calculated from the ratio of serum iron to the total iron-binding capacity (TIBC). Normal values range from 20 to 45 %. Values below 16 % indicate functional iron deficiency, while values above 45 % may suggest iron overload.

Ferritin

Ferritin is the primary storage protein for iron and reflects the body's iron reserves. Low ferritin levels (below 12–15 µg/l) are an early sign of depleted iron stores. It is important to note that ferritin is an acute-phase protein and may be falsely normal or elevated during inflammation, infections, or liver disease, even when iron deficiency is present at the same time.

Soluble Transferrin Receptor (sTfR)

The soluble transferrin receptor is a marker for cellular iron demand. It is elevated in true iron deficiency and, unlike ferritin, is not influenced by inflammation. It is therefore particularly useful for identifying iron deficiency in patients with coexisting chronic inflammation.

Total Iron-Binding Capacity (TIBC)

The TIBC (Total Iron-Binding Capacity) measures the maximum amount of iron that transferrin in the blood can bind. In iron deficiency, TIBC is elevated because the body provides more free binding sites. In iron overload or chronic disease, it is often reduced.

Clinical Significance

The combination of several iron kinetics markers is crucial for a reliable diagnosis. No single marker is sufficient on its own to fully assess iron status. Physicians interpret these markers within the clinical context, as factors such as inflammation, pregnancy, kidney disease, or genetic factors can influence the values.

Iron deficiency anaemia: Low ferritin, low serum iron, elevated TIBC, low transferrin saturation
Anaemia of chronic disease: Normal or elevated ferritin, low serum iron, low TIBC
Haemochromatosis (iron overload): Elevated serum iron, high transferrin saturation, elevated ferritin

When are Iron Kinetics Markers Measured?

Determination of iron kinetics markers is indicated in the following situations:

Suspected iron deficiency or iron deficiency anaemia (e.g., fatigue, pallor, shortness of breath)
Monitoring of iron therapy
Evaluation of anaemia of unknown cause
Suspected iron overload (haemochromatosis)
Pregnancy, chronic diseases, or following blood loss

References

World Health Organization (WHO): Haemoglobin concentrations for the diagnosis of anaemia and assessment of severity. WHO/NMH/NHD/MNM/11.1, Geneva, 2011.
Thomas L.: Labor und Diagnose – Indikation und Bewertung von Laborbefunden für die medizinische Diagnostik. 8th edition, TH-Books Verlagsgesellschaft, Frankfurt am Main, 2012.
Ganz T.: Systemic iron homeostasis. Physiological Reviews, 93(4):1721–1741, 2013. PubMed PMID: 24137020.

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