Hours change
During Ramadan the centres keep shorter days, and several also take samples in the evening, after iftar. Each centre's hours are on its page.
Before the month of fasting
People followed for diabetes or a long-term condition often have a check-up a few weeks before Ramadan, to talk it through with their doctor in good time.
The question of the fast
Whether a blood test breaks the fast is not a question the laboratory answers: ask a qualified person. The laboratory only tells you whether the test itself needs you to be fasting.