A. Serous: Serous drainage consists primarily of plasma and is characterized by a clear, pale yellow, or straw-colored fluid. It contains minimal cellular components and emerges from superficial wounds or during the initial inflammatory phase of healing. The presence of pink coloration indicates erythrocytes are present, which differentiates it from purely serous fluid. B. Sanguineous: Sanguineous drainage is rich in red blood cells, resulting in a bright red, often thick fluid that reflects active hemorrhage. It is commonly observed immediately postoperatively or in wounds with significant vascular disruption. A shift from red to pink in the patient’s drainage suggests dilution with serous fluid and a decrease in active bleeding. C. Purulent: Purulent drainage is composed of leukocytes, necrotic tissue, and bacteria, giving it a thick, opaque appearance that can range from yellow to green or brown. It is indicative of an ongoing infectious process or significant inflammatory response. The patient’s pink drainage lacks the turbidity, color, and odor characteristic of purulent material. D. Serosanguineous: Serosanguineous drainage is a mixture of serum and red blood cells, producing a light pink to pale red fluid. It commonly appears in surgical or traumatic wounds as bleeding decreases and serous exudate mixes with residual blood. This type of drainage reflects the ongoing vascular healing process, where capillary leakage continues alongside plasma exudation, consistent with the observed transition from red to pink over 24 hours.