Ruling on drawing blood samples from a fasting person for analysis

Question: What is the ruling on a person who has blood drawn from him while he is fasting in Ramadan, for the purpose of analysis from his right hand, and the amount is a medium-sized tube?

Answer: This type of analysis does not invalidate the fast; rather, it is excused; because it is something that pressing need calls for, and it is not of the same kind as the known fast-breakers established by the pure Shari'ah.