Does a blood test break the fast?

Detailed answer

No. Having a blood sample taken for a test does not break your fast. You can keep your appointment, give the sample and carry on fasting until sunset. This is the view of the vast majority of scholars, past and present.

Why it does not break the fast

The things that break the fast are eating, drinking, intimate relations and what clearly takes their place. A blood test takes something out of the body; it does not put food or drink in. The amount is small and does not weaken you in the way a large loss of blood can.

Scholars have discussed whether losing a larger amount of blood, as in cupping, breaks the fast. Even those who hold that cupping breaks the fast generally say that a small sample for a test does not, because it is a tiny amount taken for a medical need. See cupping (hijama) and donating blood for the larger amounts.

Tests that need you to fast

Some tests, such as fasting glucose or cholesterol, require you to have nothing to eat or drink for a set number of hours beforehand. Tell the nurse what time you finished suhoor so they can check it is long enough for your test.

Finger-prick tests

People with diabetes often need to check their blood sugar during the day. A finger-prick test does not break the fast, and you should not skip it. Checking your sugar is part of fasting safely; see fasting with diabetes.

Tips

• Drink well between iftar and suhoor the night before; being well hydrated can make the test easier.
• If you feel faint after the test, sit or lie down and rest for a while.
• If you feel very weak or dizzy and cannot continue, you may break the fast and make up the day later. Allah says: "Allah intends ease for you and does not intend hardship for you" (Al-Baqarah 2:185).

In short, a routine blood test is no reason to miss a fast or to postpone your care.