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Fasting Instructions

Too often people have had to reschedule a medical lab test because they did not properly fast beforehand. Certain tests require fasting because digesting food would distort the test results. For instance, eating a sugary snack before a blood test result in an unusually high blood sugar count. The test needs to be performed on a specimen from a body in its normal state.

Fasting instructions:

  • For blood tests, do not eat or drink for 10-12 hours before visiting the laboratory
  • For lipid tests, do not eat or drink for 12 hours before visiting the laboratory
  • It is okay to drink water, but no coffee, juice or tea
  • Do not smoke during the fasting period
  • Do not exercise during the fasting period as this can affect the results
  • Chewing gum can affect your test results and should be avoided while fasting
  • After the test is over, you are free to resume your normal routine

When To Start Fasting

The Salinas Valley Medical Clinic lab hours are 6:30 a.m. to 3 p.m. Monday thru Friday. Many people begin fasting the night before so they can sleep through it. Because of this, the hours between 7 and 10 are the lab’s busiest. If you are able to wait, arriving after 10 may result in a shorter visit.