The loss of plasma proteins into the gastrointestinal tract was assessed by the usual 51Cr albumin or 131I polyvinyl-pyrrolidone method in 9 patients with RA and 3 patients with PSS. In all these patients, the amounts of albumin excreted over a 4-day period were within the range of normal. Thus, no protein-losing enteropathy was demonstrated in this group of patients.
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