Complement shares its first two syllables with the word complete, and its meanings relate to completion, as in "a tangy sauce that complements the rich dessert" and "artwork that is a perfect complement to …

A complement is part of a word or phrase that completes the predicate (= the part of a sentence that gives information about the subject), as “nothing” in “They told him nothing.”

Despite being part of the innate immune system, the complement system can be recruited and brought into action by antibodies generated by the adaptive immune system. The complement system …

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The complement system plays a critical role in inflammation and defence against some bacterial infections. Complement may also be activated during reactions against incompatible blood …

A complement blood test measures the levels and/or activity of a group of proteins that are part of the complement system. This system "complements" or enhances your body's defenses against …

Feb 8, 2026 · A complement C4 (also known as a complement component 4, or simply C4) is a test to measure the level of C4 proteins you have in your blood.

Oct 24, 2024 · A C4 complement blood test measures the levels of a certain protein in your blood. The test tells your healthcare provider how well your immune system is working.

Sep 5, 2023 · Complement has long been considered a key innate immune effector system that mediates host defence and tissue homeostasis. Yet, growing evidence has illuminated a broader …

To complement is to provide something felt to be lacking or needed; it is often applied to putting together two things, each of which supplies what is lacking in the other, to make a complete whole: Two …