I was asked in reference to a Fatwa I posted from Islam Q&A regarding issues on nullifiers of Fasting. The person informed me;
Q; What if some one suffers Kidney dialysis hereditarily and having blood symptoms in urine in minor quantity.?
you have mentioned above that kidney dialysis may effect fasting if there is involve blood extraction , cleaned and returned to body after putting some additional chemical substances. But I want to know if some only suffers kidney Dialysis by birth and produce minor quantity of blood in urine.And there is no returning of blood to body involved then Does it effect his/her fasting ?
A; All-Praise is due to Allah,
The Sheikh mentions above, Kidney dialysis, in which blood is extracted, cleaned and then returned to the body with the additional of chemical substances such as sugars and salts etc. is regarded as invalidating the fast. (Fataawa al-Lajnah al-Daa’imah, 10/19)
The reason to why this is part of things that nullify ones Fast is the fact that sugars & salts have been injected into the blood which supplies the body with nutrients in addition gives energy to the body. For this reason in this case it becomes amongst the nullifiers of Fasting. In general with things that nullifies ones Fast is connected to a Fundmental Principle, and that is any thing that reaches the stomach that is a type of Food or drink or any thing that is considered to provide the body with nutrients and energy is rulled as a nullifier of Fasting...
As I have understood from what you have mentioned above if there is retured blood with out the additional sugars and salts then this does not nullify ones Fast for the Fact that there is nothing that is nourishing the body. But bare in mind that if there is some sort of sugars or salty chemicals that nourishes the body then it is considered amongst the nullifiers of Fasting. So in this case one would have to ask the Doctor or sergeant if there is any sort of this elements or substances that provide nourishment to the body in a large percentage, in-order for one to judge it's case.
Also one must bare in mind that if this person becomes weak and tired form such a procedure then it is better for them to break their Fast as Allah The All-Mighty said in a verse translated close to the meaning, 'The month of Ramadhan [is that] in which was revealed the Qur'an, a guidance for the people and clear proofs of guidance and criterion. So whoever sights [the new moon of] the month, let him fast it; and whoever is ill or on a journey - then an equal number of other days. Allah intends for you ease and does not intend for you hardship and [wants] for you to complete the period and to glorify Allah for that [to] which He has guided you; and perhaps you will be grateful.' (2/185)
But if this person can handle, then of course there is no harm in them continue to Fast, and Allah knows best...