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To the Editor:—
In "Sulfobromophthalein" (202:979, 1967) Dr. Charm states that "normal results from a sodium sulfobromophthalein test (BSP) effectively rule out varices [esophageal] as a source of bleeding [upper gastrointestinal]." The BSP and other liver function tests, however, may be normal in hemorrhage from esophageal varices secondary to extrahepatic portal venous block, eg, acquired portal venous thrombosis.
Davidson P. Liver Function Tests and Esophageal Hemorrhage. JAMA. 1968;203(9):810. doi:10.1001/jama.1968.03140090194027
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