A DAT Was Performed on a Patient Suspected of Having

question 37

Multiple Choice

A DAT was performed on a patient suspected of having autoimmune hemolytic anemia. The following results were obtained: PS AHG 3+, Anti-IgG 2+, Anti-C3d-negative. These results mean:

• A) the test is invalid.
• B) the patient's cells are coated with IgG.
• C) the patient's cells are coated with C3d.
• D) the patient's cells are coated with both IgG and C3d.

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Definitions:

Myofilaments

The filaments of myofibrils, constructed from proteins, primarily actin, and myosin, which are essential for muscle contraction.

I Bands

I Bands are the light-appearing regions of a sarcomere in muscle fibers, reflecting areas where thin filaments do not overlap with thick filaments.

Z Lines

The boundaries in a striated muscle fiber that separate one sarcomere from the next, crucial for muscle contraction.

H Zone

The H Zone is a region within the sarcomere of a muscle fiber that appears lighter under a microscope and shortens during muscle contraction, it is found in the center of the A band.