Digoxin determination in the uremic patient: three immunoassays compared.

between CA-19-9 concentrations in blood and whether or not patients were taking supplements. Thus, cystic fibrosis is one of the first benign diseases shown to be associated with high CA-19-9 concentrations in blood. The origin of CA-19-9 in these patients instill unknown. it is unlikely to be derived from the pancreas because patients with pancreatitis reportedly have low concentrations of this antigen in their serum (2,3). It may, however, be a specific mucin produced by cystic fibrosis patients. If so, a study on its mechanism of production might provide an insight into the etiology of cystic fibrosis. Finally, measurement of CA-19-9 in blood could be an adjuvant diagnostic aid in cystic fibrosis.