Four recently available kits of guaiac resin-impregnated paper for demonstrating the presence of blood in faeces were compared with Hemoccult II in in vitro testing. Hemo-FEC most closely resembled Hemoccult II in its sensitivity with freshly prepared kits and kits prepared one week earlier with or without rehydration before testing. Gamma Fe-Cult and Fecatest were more sensitive than Hemoccult II whereas Camco-Pac Guaiac was much less sensitive. Rehydration of kits prepared several days beforehand appears to be useful in restoring sensitivity lost by all the kits tested.
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Frommer et al. (1981) studied this question.
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