What are the main clinical manifestations of systemic lupus erythematosus?

*For medical professionals to read and reference Xueba Challenge, waiting for you! The main clinical manifestations of systemic lupus erythematosus are A.
It is common in women of childbearing age B.
Skin, mucous membrane and joint manifestations C.
Nephritis D.
Serositis E.
Anemia in the previous stage Answer: C Analysis: Rheumatoid factor positive is only seen in 70% of the patients In patients with rheumatoid arthritis, it can also be seen in other autoimmune diseases, so the diagnosis should be made in combination with clinical manifestations (do not choose A)
.

Negative rheumatoid factor cannot completely rule out rheumatoid arthritis.
About 30% of rheumatoid arthritis patients are negative for rheumatoid factor (B is wrong, C is right), so this topic chooses
C.

Anti-nuclear antibody refers to the antibody against the components in the nucleus, including four types of anti-DNA, anti-histone, anti-non-histone and anti-nucleolar antibodies.
Rheumatoid factor is not an anti-nuclear antibody (do not select D)
.

Rheumatoid factor is divided into IgM type, IgG type and IgA type.
Currently, the main detection in clinical work is gM type (not E)
.

Link to the previous article: Which description is correct about rheumatoid arthritis and rheumatoid factor?