Is it permissible to have a blood test whilst fasting?
Published as Fasting FAQs Part 1 (3/27)
Question
Is it permissible to have a blood test whilst fasting?
Answer
Yes and this will not invalidate the fast. However, it will be disliked to have a blood test if one fears that by having a blood test, he/she will become weak and thus will be unable to maintain the fast.
Where scholars differ, it’s safer to take the more cautious view.
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Source: Jamiatul Ulama KZN — https://jamiat.org.za/fasting-faqs-2/
Fatawa SA: https://fatawa.co.za/fatwa/jamiat-16811-3