MICHAEL J. WEAVER, M.D.
To the editor: In their report, on guaiac slide tests Layne and his associates (1) describe the solution of 4000 µL of blood per decilitre of gastric juice, a concentration that did not produce a positive slide test result, as having a hematocrit of 4%. This hematocrit is incorrect because whole blood with a hemoglobin of 15 to 16 g/dL was used rather than packed erythrocytes in preparing the solutions for testing. If the hematocrit of the whole blood had been 40,the hematocrit of the 4000 µL/dL solution would have been 1.6%.
This minor correction does not detract from the
WEAVER MJ. Blood in Gastric Juice and Guaiac Slide Tests. Ann Intern Med. ;96:253. doi: 10.7326/0003-4819-96-2-253_2
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Published: Ann Intern Med. 1982;96(2):253.
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