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ferritin
This term is used almost exclusively within medical, biochemical, and clinical contexts. It refers to the protein shell that sequesters iron, and in a clinical setting, "ferritin" is frequently used as a metonym for the concentration of this protein in the blood to assess a patient's total iron stores.
As a biochemical substance and a medical marker, it is treated as an uncountable noun. It does not have a plural form in standard medical discourse, as it refers to the protein species or the measured level rather than individual protein molecules.
Meanings
Examples
The doctor ordered a blood test to check my ferritin levels.
Low serum ferritin is a highly specific indicator of iron deficiency anemia.
Your ferritin is quite low, so we should start you on an iron supplement.
Ferritin acts as a buffer to prevent the toxicity of free iron in the cell.
I wonder if my fatigue is caused by low ferritin.
The liver is the primary site for ferritin storage in the body.
High levels of ferritin can sometimes be a marker of systemic inflammation.
We need to monitor the patient's ferritin to ensure they are not overloading on iron.