Fasting before a blood test: what you need to know

Some blood tests are more accurate when you haven't eaten. Here's a simple guide, but always follow the specific advice we give you.

Tests that usually need fasting

• Fasting blood sugar — typically 8–10 hours.
• Lipid profile (cholesterol) — often 9–12 hours.
• Some liver and kidney panels — as advised.

Can I drink water?

Yes — plain water is encouraged and actually makes it easier to draw blood. Avoid tea, coffee, juice and food during your fasting window.

Tips for an easy test

• Book a morning slot so you fast overnight while you sleep.
• Take regular medicines only if your doctor says it's okay.
• Ask about home sample collection if travelling while fasting is difficult.