Which type of exudate contains blood?

Hemorrhagic exudate is characterized by the presence of blood, indicating that there has been damage to blood vessels and a subsequent leakage of red blood cells into the tissue or body cavity. This type of exudate typically occurs in conditions where there is significant tissue injury or inflammation, such as in severe infections or traumatic injuries. The presence of blood in the exudate signifies a more severe pathological process compared to other types of exudates that are primarily composed of serum, pus, or fibrin without significant bleeding.

In contrast, serous exudate is clear and straw-colored, typically arising from mild inflammation without the presence of blood. Purulent exudate is thick and yellow or green, filled with pus resulting from infection, indicating the accumulation of white blood cells and dead pathogens, but it does not contain blood. Fibrinous exudate contains a higher concentration of fibrinogen and fibrin, often seen in conditions like infections or inflammation, but it does not necessarily involve bleeding into the tissue.