Learn the practical application of the 72-hour minimum and 10-day maximum rules for possible days of menses through detailed case studies and step-by-step guidance.
Reviewed by Ustad Abas Arshad, Islamic scholar, on
During possible days of menses, any blood seen is considered menstruation, but if bleeding stops before 72 hours, it's ruled as abnormal bleeding requiring makeup prayers.
The possible days of menses (PDM) system provides clear guidance for determining when bleeding should be considered menstruation versus abnormal bleeding. This framework operates on three essential rulings that work together to help women navigate uncertain bleeding patterns within their menstrual cycle.
Whenever blood is seen within the possible days of menses, it is always considered menstruation. This "whenever blood is seen" rule applies to all colored vaginal discharge other than completely white or clear discharge. There is no consideration for the shade of color, the thickness of the blood, or what symptoms accompany it.
When this ruling applies, two important consequences follow:
Scenario: A woman has a menses habit of 5 days and a purity habit of 25 days. After her menstruation ends, she sees 25 days of purity like her habit, and then bleeding starts on April 20th at 2 pm.
Application:
Important Note: This is a ruling in the moment, and depending on what happens, there is a chance that this ruling may change in hindsight. The future is unknown, and there is usually no way of determining whether the blood will exceed 10 complete days or stop beforehand until it happens.
Whenever blood stops before 3 complete days (72 hours) within the possible days of menses, it is ruled as abnormal bleeding (istiḥāḍa), and a woman is obliged to make wuḍūʾ and pray.
"Stops" means that there is no sighting of colored vaginal discharge. When a woman checks her kursuf, she sees white discharge, clear discharge, or no discharge. She is also reasonably certain that the bleeding will not return.
"Before 3 complete days" means that from the onset of blood to the time it stops, the duration is less than 72 hours. The blood did not meet the stipulated menstrual minimum. Consequently, this blood is now considered unsound blood (istiḥāḍa) in retrospect.
Important: Istiḥāḍa does not require a ghusl when it stops, but rather it requires wuḍūʾ before praying.
Scenario: Building on the previous situation, on April 22nd at 2 pm, the blood stops.
Calculation and Ruling:
If a woman thinks that her bleeding will stop before the menstrual minimum of 72 hours, she must follow this four-step process:
She delays praying until closer to the end of the prayer time. She delays praying just in case the bleeding returns. She delays it to the extent that she has enough time to make wuḍūʾ and pray before the prayer time exits. She should not miss the prayer of that time if it is confirmed that her bleeding has stopped.
For the ʿAṣr prayer time specifically, she delays praying until closer to the end of the preferred prayer time.
She must make up all the prayers missed for the days that were assumed to be menses. In retrospect, because the bleeding stopped before the menstrual minimum of 72 hours, what she saw is ruled as abnormal uterine bleeding (istiḥāḍa). Since istiḥāḍa does not prohibit the actions that sound blood prohibits, she owes the performance of the missed prayers in hindsight.
She is not sinful for missing these prayers because she had a valid excuse.
Note if the bleeding is followed by a purity span of at least 15 complete days (360 hours). If the blood does not return within the possible days of menses and a purity span of at least 15 complete days (360 hours) free of blood follows it, this blood is ruled as abnormal uterine bleeding (istiḥāḍa) with certainty.
She continues to pray her prayers and fast if it is Ramaḍān because she is not seeing any blood.
Consider any blood that returns within the possible days of menses to be menses. If the blood returns within the 10 possible days of menses, based on the first PDM ruling, the reappearance of blood will take the ruling of menstruation.
Any time blood is seen within the possible days of menses, it is ruled as menses.
Whenever blood stops at 3 complete days (72 hours) or more within the possible days of menses, it is ruled as menstruation (ḥayḍ), and a woman is obliged to take a ghusl and pray.
"Stops" means that there is no sighting of colored vaginal discharge. When a woman checks her kursuf, she sees white discharge, clear discharge, or no discharge. She is also reasonably certain that the bleeding will not return.
"At 3 complete days" means that from the onset of blood to the time it stops, the duration is at least 72 hours. The blood met the menstrual minimum. So, menstruation is confirmed with certainty.
"Ghusl" refers to the purificatory shower that removes a person from major ritual impurity. It is obligatory to take a ghusl when menstrual bleeding either stops within the 10 possible days or the menstrual maximum of 10 complete days (240 hours) is reached.
When bleeding meets or exceeds the 72-hour minimum, three important consequences follow:
Scenario: A woman has a menses habit of 4 days and a purity habit of 30 days. After her menstruation ends, she sees 30 days of purity like her habit, and then bleeding starts on June 10th at 6 pm.
Timeline and Application:
Not every woman will need to apply these PDM rulings. For some women, when their menses starts, they experience a steady menstrual flow from beginning to end. For others, they see random spotting, and these PDM rulings may be applicable for their situation.
Understanding these three essential rulings for possible days of menses helps women navigate uncertain bleeding patterns with confidence, knowing exactly when to treat bleeding as menstruation and when to recognize it as abnormal bleeding requiring different ritual obligations.
The possible days of menses framework with its 72-hour minimum and 10-day maximum provides clear guidance for handling uncertain bleeding. The three rulings work together: all blood within PDM is initially considered menstruation, blood stopping before 72 hours becomes abnormal bleeding requiring prayer makeup, and blood lasting 72 hours or more confirms menstruation requiring ghusl. These case studies demonstrate how to apply these rulings practically in real-life situations.
What happens if I see blood within my possible days of menses?
Any blood seen within the possible days of menses is always considered menstruation, regardless of color, thickness, or symptoms. You must immediately stop praying, fasting, and follow all menstrual prohibitions.
What if my bleeding stops before 72 hours during possible days of menses?
If bleeding stops before 3 complete days (72 hours), it's ruled as abnormal bleeding (istiḥāḍa) in retrospect. You must make wuḍūʾ, resume praying, and make up all prayers missed during those days.
How do I know if my bleeding meets the menstrual minimum?
Bleeding must last at least 72 hours (3 complete days) from onset to stopping to be considered valid menstruation. Once this minimum is met, menstruation is confirmed with certainty.
What should I do when bleeding stops after 72 hours or more?
When bleeding stops at or after 72 hours, it's confirmed menstruation. You must take ghusl before praying again, but you don't need to make up any missed prayers from the menstrual period.
A 15-day (360 hours) purity span confirms abnormal bleeding status with certainty
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Reviewed by
Islamic scholar
Ijazah in the Islamic sciences, with an unbroken chain of transmission, Trained in issuing fatwa in the Hanafi madhab, Jamia Al-Karam; Al-Azhar University
Co-founder of flowdays. He reviews the articles in the flowdays library.
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