CRP is a highly sensitive ______.

CRP is a highly sensitive ______.

• A. Negative acute phase reactant
• B. Positive acute phase reactant
• C. Adaptive immune protein
• D. Anticoagulant

Answer: (B)

Inflammation triggers the liver to produce acute-phase proteins, and C-reactive protein is one of the most prominent of these. Its concentration rises rapidly in response to inflammatory signals, so it is classified as a positive acute-phase reactant. The term "highly sensitive" reflects the ability of hs-CRP assays to detect even small rises, which is useful for identifying low-level or chronic inflammation and assessing cardiovascular risk. CRP's role is part of innate immunity: it binds to phosphocholine on dead or dying cells and some bacteria, and it activates the classical complement pathway to promote phagocytosis. This makes it a marker that increases with inflammation rather than something involved in adaptive immunity like antibodies. During the acute-phase response, many proteins that normally help maintain plasma levels decrease (negative acute-phase reactants), while CRP increases, highlighting its distinctive rise in inflammation.

Inflammation triggers the liver to produce acute-phase proteins, and C-reactive protein is one of the most prominent of these. Its concentration rises rapidly in response to inflammatory signals, so it is classified as a positive acute-phase reactant. The term "highly sensitive" reflects the ability of hs-CRP assays to detect even small rises, which is useful for identifying low-level or chronic inflammation and assessing cardiovascular risk.

CRP's role is part of innate immunity: it binds to phosphocholine on dead or dying cells and some bacteria, and it activates the classical complement pathway to promote phagocytosis. This makes it a marker that increases with inflammation rather than something involved in adaptive immunity like antibodies.

During the acute-phase response, many proteins that normally help maintain plasma levels decrease (negative acute-phase reactants), while CRP increases, highlighting its distinctive rise in inflammation.