A patient diagnosed with SLE exhibits which signs related to Type 3 hypersensitivity?

In systemic lupus erythematosus (SLE), Type 3 hypersensitivity plays a significant role in the manifestation of the disease. This type of hypersensitivity involves the formation of immune complexes, which are aggregates of antibodies and antigens. These immune complexes can deposit in various tissues, leading to inflammation and tissue damage.

When considering the signs related to Type 3 hypersensitivity, the presence of blood in sputum is particularly relevant. This symptom indicates potential damage to the pulmonary vasculature or lung tissue, which can occur when immune complexes deposit in the lungs, leading to conditions such as pleuritis or pulmonary hemorrhage. The occurrence of blood in sputum is often associated with serious complications in SLE and highlights the systemic consequences of immune complex deposition.

While skin rashes, joint pain, and weight loss can occur in SLE, they are not directly attributed to Type 3 hypersensitivity. Skin rashes often arise from other immune responses, joint pain can be due to various factors including inflammation, and weight loss might be a result of overall disease activity or systemic involvement but does not specifically relate to immune complex deposition. Thus, blood in sputum stands out as a sign particularly connected with the complications of Type 3 hypersensitivity in