C4

What does "C4" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.

Explanation

"C4" in the context of medicine refers to a protein that is part of the immune system. This protein helps the body defend against infections and diseases. It is often measured in blood tests to help doctors diagnose certain conditions. If the levels of C4 are too high or too low, it might indicate a problem with the immune system.

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