The cases of 20 patients, each of whom has a positive lupus erythematosus cell preparation and a negative antinuclear factor test, are presented. The concept of a false-positive lupus erythematosus preparation is suggested. Five common mechanisms causing a false-negative antinuclear factor test are discussed and evaluated. Clinical material from the 20 patients is described and pitfalls in diagnosing systemic lupus erythematosus are reviewed.
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Koller et al. (1976) studied this question.