Shari’ah (laws of Islam) are balanced and have taken into consideration
different circumstances.
If a person is ill to such an extent that he will faint due to fasting, then
he will be excused from fasting. Such a person may give Fidya (compensation)
for not fasting. However, taking blood tests during fasting is permissible
and that does not invalidate the fast.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai
FATWA DEPT.