The nurse is assessing a patient suspected of having a duodenal ulcer. The patient admits to having a family history of this disease. The nurse knows that another known risk factor for duodenal ulcers is which of the following blood types?


• People with blood type O develop duodenal ulcers more frequently than the standard population, suggesting a familial basis.

• Type A, B, and AB are not linked to duodenal ulcers.

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