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In Reply.—Drs Robson and Leung's analysis of our findings is most welcome. As they correctly point out, chronic states associated with increased aldosterone levels will not result in alkaline urine. This decreases the number of possible causes of alkaline urine in our patients, allowing us to concentrate on fewer possible causes, including recent acute vomiting, "alkaline tide," alkaline-ash diet, and osteoporosis. We appreciate their contribution and
hope to use this information in further studies of this phenomenon.