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Patch Testing Under Biologics: Six Cases From a Tertiary Centre. [PDF]

Contact Dermatitis
Chiei-Gallo A, Barei F, Marzano AV, Ferrucci SM.   +3 more
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False-Positive Alkaloid Reactions

Journal of Pharmaceutical Sciences, 1980
A variety of nonnitrogenous oxygenated compounds gave false-positive alkaloid reactions with Dragendorff's spray reagent. These compounds reacted positively if the oxygen function and the β-carbon bonded to the oxygen had high electron density. Thus, aldehydes, ketones, lactones, ethers, esters, epoxides, and peroxides with an ethylene bond or free ...
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FALSE POSITIVE SCHICK REACTIONS

Journal of the American Medical Association, 1950
To the Editor:— In their article on false positive reactions to the Schick test (J. A. M. A. 142 :390 [Feb. 11] 1950) Cohen, Schneck and Dubow reported that comparison of results of Schick tests with circulating diphtheria antitoxin in 114 young women revealed 51 of 52 specimens of blood from Schicknegative subjects contained more than 0.01 unit of ...
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Biologic False-Positive Reactions for Syphilis

JAMA: The Journal of the American Medical Association, 1968
To the Editor:— The problem posed ( 203 :996, 1968) regarding a 54-year-old housewife with a reactive fluorescent Treponemal antibody test merits an expanded discussion particularly of the possibility of a biologic false-positive (BFP) reaction. Syphilis is the great mimic, and we of the Osler tradition recall, "When it comes to syphilis, suspect your
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BIOLOGICAL FALSE-POSITIVE REACTIONS

Archives of Dermatology, 1966
To the Editor: In their recent article, Kwittken and Goldberg (Arch Derm93:177, 1966) considered their patient's weakly reactive venereal disease research laboratory test for syphilis (VDRL) and complement fixation tests to be biologic false-positive (BFP) reactions.
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FALSE-POSITIVE REACTION FOR ACETONURIA

Journal of the American Medical Association, 1959
ABSTRACT To the Editor:— While testing, with phenolsulfonphthalein (PSP), the renal function of a patient with well-regulated diabetes mellitus, a strongly positive reaction for acetonuria was noted. This false-positive reaction was noted with the conventional test for acetone, using sodium nitroprusside, as well as with Acetest tablets (Ames Co.) and ...
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BIOLOGICALLY FALSE-POSITIVE SEROLOGIC REACTIONS

Journal of the American Medical Association, 1957
For many years physicians have been confronted with the problem of how to evaluate or interpret serologic reports obtained from the laboratory in determining the presence or absence of a syphilitic infection. Most physicians have encountered nonsyphilitic patients with unexplained positive serologic reactions.
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False-Positive Reactions for Porphobilinogen

JAMA, 1966
FOR MANY YEARS a positive test for porphobilinogen in urine as described by Watson and Schwartz in 1941 1 was accepted as diagnostic of acute intermittent porphyria. This concept was strengthened by 1,000 routine urinalyses by Hammond and Welker 2 in which no false-positive reactions were found.
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