Intelligence is usually normal, although mild deficiency has occurred in a few affected persons. Infertility is the rule in men with Bloom's syndrome, and fertility appears to be reduced in women. The risk of cancer is much greater than normal throughout life, of the variety of sites and types that affect the general population. There is no treatment for the underlying cause of Bloom's syndrome, and therefore medical intervention is primarily preventative. Adults with Bloom's syndrome should be more attentive than others in their surveillance for cancer, maintaining close contact with a physician knowledgeable about the syndrome, and paying particular attention to symptoms that could be early evidence of a treatable precancerous condition.
Respiratory infections require prompt antibiotic treatment.
Although growth hormone therapy has been attempted to increase height in children with Bloom's syndrome, it does not appear to be effective. In addition, there is some concern that the use of growth hormone may increase the risk for later malignancies. The diagnosis of Bloom's syndrome can be confirmed or ruled out by a laboratory test known as a chromosome study, as blood and skin cells show a characteristic pattern of chromosome breakage and rearrangement. Recently, the gene for Bloom's syndrome was isolated. The gene is located on chromosome 15, and one particular mutation in the gene has been identified as the cause of Bloom's syndrome in the vast majority of Ashkenazi Jews.