How long is fasting for blood work?
You usually need to fast for 8–12 hours before a test. Most tests that require fasting are scheduled for early in the morning. That way, most of your fasting time will be overnight.
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Can you eat before blood test?
You can eat and drink as normal before some blood tests. But if you're having a "fasting blood test", you will be told not to eat or drink anything (other than water) beforehand. You may also be told not to smoke before your test.
How long for blood test results Ontario?
If you have questions about your results, or your results are not available online, please contact the location where you were tested or your health care provider. Results can take up to 4 days.