How long should you fast before a blood test?

Most common blood tests require fasting for 8 to 12 hours, especially glucose and lipid profile checks. During that period, plain water is allowed while sugary drinks, milk, and coffee should be avoided.

If you take prescribed medication, ask your doctor or GlobalMed Phú Quốc nurse for instructions before the test. Fasting longer than required can cause fatigue or dizziness and does not improve the result quality.

For convenience, book your test in the morning, get enough sleep, and avoid alcohol for 24 hours beforehand. This helps reduce unwanted fluctuations in the indicators.