A level of impurity which is rabbinically decreed, where the communication of impurity would have been shortly before she discovered the blood: Niddah 7a
Impurity of a man who slept with a woman shortly before she discovered blood: Niddah 6a
Impurity of a man who slept with a woman shortly before she discovered a bloodstain: Niddah 6a
Impurity of items on which she lay or sat shortly before blood was discovered: Niddah 5b-6a
Impurity of items on which she lay or sat shortly before a bloodstain was discovered: Niddah 5b-6a
Impurity of items which she touched shortly before blood was discovered: Niddah 6a
Impurity of items which she touched shortly before a bloodstain was discovered: Niddah 6a
Impurity of foods, or covered pottery, which she touched shortly before blood was discovered: Niddah 6a
Impurity of foods, or covered pottery, which she touched shortly before a bloodstain was discovered: Niddah 6a
Items on which she performed "Heset" shortly before blood was discovered: Niddah 5b-6a
The status of Terumah which she touched shortly before finding blood: Niddah 6a-b
The status of sanctified items which she touched shortly before finding blood: Niddah 6a
Impurity for non-holy items which are treated with purity, which were touched by a woman before she saw menstrual blood: Niddah 6b, 7a
Impurity of dough which awaits tithing, from a woman who touched it shortly before experiencing menstrual bleeding: Niddah 7a