Correct Statements About Systemic Lupus Erythematosus
Statement (b) photosensitivity is common is CORRECT, and statement (a) anti-dsDNA antibodies are positive in many other conditions is also CORRECT. The remaining statements are incorrect.
Analysis of Each Statement
a) Anti-dsDNA antibodies are positive in many other conditions - CORRECT
This statement is accurate. While anti-dsDNA antibodies are prominent in SLE, the conception of them as highly SLE-specific is a misconception. Anti-dsDNA can be observed in healthy individuals as well as in other autoimmune syndromes, bacterial infections, viral infections, parasitic infections, and cancer 1. The term anti-dsDNA encompasses a heterogeneous set of antibodies with different antigenic specificities, not a uniform SLE-specific entity 1.
Clinical caveat: The specificity varies significantly by test method. CLIFT and certain fluorescence enzyme immunoassays show specificity ≥90-98% 2, but other methods show lower specificity. Anti-dsDNA was found in 3% of patients with multiple medical problems and 0% in healthy controls in one study 3, though the 2023 guidelines emphasize they can occur in various conditions 1.
b) Photosensitivity is common - CORRECT
Photosensitivity is a well-recognized common feature of SLE. Photo-protection is specifically recommended as beneficial in patients with skin manifestations 4. While the provided evidence doesn't quantify exact prevalence, photosensitivity is included in classification criteria and management guidelines, confirming its common occurrence in SLE 4.
c) Patients usually present with leukocytosis - INCORRECT
This is false - SLE patients typically present with leukopenia, not leukocytosis. Leukopenia is significantly more common in early SLE compared to SLE-mimicking conditions 5. This hematological abnormality is part of the classification criteria and represents immune-mediated destruction of white blood cells, which is characteristic of SLE pathophysiology.
d) It affects men more frequently - INCORRECT
SLE predominantly affects women, not men. This is fundamental epidemiological knowledge about SLE - the disease has a strong female predominance with a female-to-male ratio of approximately 9:1, particularly during reproductive years. This statement is completely contrary to established SLE demographics.
e) It rarely affects the kidneys - INCORRECT
Renal involvement is common and clinically significant in SLE. The evidence extensively discusses lupus nephritis as a major manifestation, with anti-dsDNA antibodies specifically associated with nephritis 1. Multiple treatment trials focus on lupus nephritis 6, and renal disease was present in 66.7% of patients with rising anti-dsDNA levels at diagnosis 7. The EULAR guidelines dedicate substantial attention to lupus nephritis management, emphasizing its frequency and importance 4, 6.
Summary of Correct Answers
Only statements (a) and (b) are correct: