Which of the following is a potential complication of primary immunodeficiency disorders?

Explanation: The correct answer is d. Immunoglobulin levels. Immunoglobulin levels, specifically IgG, IgM, and IgA, are commonly measured to assess immune function and identify deficiencies in immunoglobulin production. Abnormalities in immunoglobulin levels can indicate the presence of an immunodeficiency disorder.

Incorrect choices:

a. A complete blood count (CBC) provides information about various blood components, such as red blood cells, white blood cells, and platelets, but it does not specifically assess immune function.

b. A chest X-ray may be used to evaluate the condition of the lungs and detect infections, but it is not a specific test for immunodeficiency disorders.

c. Allergy skin testing is used to diagnose allergies and assess the body's response to allergens, but it is not a diagnostic test for immunodeficiency disorders.

Explanation: The correct answer is a. Severe combined immunodeficiency (SCID). SCID is a severe and rare primary immunodeficiency disorder characterized by the absence or severe impairment of both T and B cells, leading to a profound deficiency in cellular and humoral immunity.

Incorrect choices:

b. X-linked agammaglobulinemia (XLA) primarily affects B-cell function, resulting in a lack of mature B cells and low levels of immunoglobulins, but does not typically involve T-cell deficiency.

c. Wiskott-Aldrich syndrome affects platelet function and immune system regulation, but it is not characterized by a deficiency of both T and B cells.

d. Common variable immunodeficiency (CVID) is characterized by reduced levels of immunoglobulins, particularly IgG and IgA, but it does not typically lead to a complete deficiency of both T and B cells.