مسائل المنتخبه (Articles Of Islamic Acts) - الخوئي، السيد أبوالقاسم - الصفحة ٩٤ - acts relating to istihaza

and she cannot decide whether that blood is of menses or not she should not take herself as menopause.
٤٤٦. The period of menses is not less than ٣ days and more than ١٠ days and if the period during which blood is discharged falls short of ٣ days even to a smallextent that blood is not considered as menses.
٤٤٧. The blood of menses comes our continuously for the first ٣ days. In case, therefore, blood comes out for ٢ days and then stops coming for ١ day and then comesout again for ١ day, it is not menses.
٤٤٨. In the case of menses it is necessary that the blood comes our of the private part at the initial stage but it does not essential continue coming out for ٣day. It is sufficient, however, that blood is present within the private part of the woman. Furthermore, if a woman is purified of blood for a very short time during thefirst ٣ days (as is common among all or some women) even then the blood discharged will be menses.
٤٤٩. It is not necessary that a woman should have bleeding on the ١st and the ٤th night, but it is essential that bleeding should not discontinue on the ٢nd and the٣rd night. For example, if bleeding commences on the morning of the ١st day and continues till sunset on the ٣rd day, it would be considered as menses. And if blood startscoming from the middle of the ١st day and stops at the same time on the ٤th day also the condition is the same (i.e. the blood too is menses).
٤٥٠. If blood is discharged from the body of a woman with the signs of menses or it comes during the days of her habit, continuously or ٣ days and then stops and thereafterblood is discharged from her body once again, and it has signs of menses or it comes during the days of habit and if the total number of days during which the blood came andstopped is not more than ten, the middle days during which she remained pure will also be treated to be the days of menses.