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<span>Fasting for a Blood Test</span>
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<section><div class="mp-content"><h2>What is fasting for a blood test?</h2>
<p>If your health care provider has told you to fast before a blood test, it means you should not eat or drink anything, except water, for several hours before your test. While you're fasting for a blood test, you also should <strong>not</strong>:</p>
<ul>
<li>Chew gum</li>
<li>Smoke</li>
<li>Exercise</li>
</ul></div>
</section>
<section><div class="mp-content"><h2>How long do I have to fast before the test?</h2>
<p>You usually need to fast for 8 to 12 hours before a test, but your provider will tell you exactly how long to fast. For certain tests, you may be asked not to drink alcohol for a longer period of time.</p>
<p>If your blood test requires fasting, you can usually schedule the test early in the morning. That way, most of your fasting time will be while you are sleeping.</p></div>
</section>
<section><div class="mp-content"><h2>Why do I need to fast before my blood test?</h2>
<p>When you eat and drink, your bloodstream absorbs sugar, fat, protein, and other nutrients in those foods and beverages. That could affect the results of certain blood tests and lead to the wrong diagnosis.</p></div>
</section>
<section><div class="mp-content"><h2>What types of blood tests require fasting?</h2>
<p>Some examples of common blood tests that usually require fasting are:</p>
<ul>
<li><strong><a data-pid="690" href="https://medlineplus.gov/lab-tests/blood-glucose-test/">Blood sugar (glucose) tests</a>.</strong> These tests measure the level of <a data-tid="6121" href="https://medlineplus.gov/bloodglucose.html">blood glucose</a> in a sample of your blood. They are used to help diagnose and monitor <a data-tid="4" href="https://medlineplus.gov/diabetes.html">diabetes</a>, <a data-tid="5784" href="https://medlineplus.gov/prediabetes.html">prediabetes</a>, and <a data-tid="1408" href="https://medlineplus.gov/diabetesandpregnancy.html">gestational diabetes</a> (diabetes that starts during pregnancy). Not all blood glucose tests require fasting, so ask your provider if you need to fast for your test.</li>
<li><strong><a data-pid="750" href="https://medlineplus.gov/lab-tests/cholesterol-levels/">Cholesterol levels tests (lipid panel)</a>.</strong> These tests measure the level of fats, called lipids, in your bloodstream, including <a data-tid="26" href="https://medlineplus.gov/cholesterol.html">cholesterol</a> and <a data-tid="4277" href="https://medlineplus.gov/triglycerides.html">triglycerides</a>. The test results help show your risk of getting <a data-tid="277" href="https://medlineplus.gov/heartdiseases.html">heart disease</a>.</li>
<li><strong><a data-pid="28141" href="https://medlineplus.gov/lab-tests/basic-metabolic-panel-bmp/">Basic metabolic panel (BMP)</a>.</strong> This is a group of tests that measures several natural chemicals in your blood. The results give your provider information about how well your organs are working, including your heart, kidneys, and liver.</li>
</ul>
<p>Other types of tests may require fasting, so always ask your provider if you aren't sure whether you should fast before your test.</p></div>
</section>
<section><div class="mp-content"><h2>Can I drink anything besides water during a fast?</h2>
<p>No. Juice, coffee, soda, and other beverages can get in your bloodstream and affect your results. But you can drink water. It's good to drink water before a blood test. It helps keep more fluid in your veins, which can make it easier to get a sample of your blood.</p></div>
</section>
<section><div class="mp-content"><h2>Can I continue taking medicine during a fast?</h2>
<p>Ask your provider whether it's okay to take your usual prescription medicines and/or over-the-counter medicines. But don't stop taking your medicines unless your provider tells you to stop.</p>
<p>Let your provider know about any vitamins and supplements that you take, too. That way you'll be sure to avoid taking anything that could affect your test results.</p></div>
</section>
<section><div class="mp-content"><h2>What if I make a mistake and have something to eat or drink besides water during my fast?</h2>
<p>Tell your provider if you eat or drink before your test. You may need to reschedule the test for another time when you can fast to make sure you get accurate results.</p></div>
</section>
<section><div class="mp-content"><h2>When can I eat and drink normally again?</h2>
<p>You'll be able to eat as soon as your test is over. You may want to bring a snack with you, so you can eat right away.</p></div>
</section>
<section><div class="mp-content"><h2>Is there anything else I need to know about fasting before a blood test?</h2>
<p>If you don't know whether you should fast for your blood test, ask your provider at least a day before your test so you'll have time enough time to fast.</p>
<p>If you fast before a test when you <em>don't</em> need to, that may affect your results, too. That's why it's important to find out for sure whether you need to fast.</p>
<p>Always ask your provider any questions you have about how to prepare for your test. Taking the right steps before a blood test helps make sure your results will be accurate.</p></div>
</section>
<section><div class="mp-refs mp-content"><h2>References</h2>
<ol>
<li>Allina Health [Internet]. Minneapolis: Allina Health; Fasting for a Blood Test; [cited 2022 Jul 14]; [about 1 screen]. Available from: <a href="https://www.allinahealth.org/-/media/allina-health/files/15008fastingpt.pdf" target="bibliowin">https://www.allinahealth.org/-/media/allina-health/files/15008fastingpt.pdf</a></li>
<li>Centers for Disease Control and Prevention [Internet]. Atlanta: U.S. Department of Health and Human Services; Testing for Diabetes; [updated 2021 Aug 10; cited 2022 Jul 14]; [about 3 screens]. Available from: <a href="https://www.cdc.gov/diabetes/diabetes-testing/" target="bibliowin">https://www.cdc.gov/diabetes/diabetes-testing/</a></li>
<li>Cleveland Clinic: Health Essentials/Family Medicine [Internet]. Cleveland (OH): Cleveland Clinic; c2022. What You Should Know About Fasting Before a Blood Test; 2022 Feb 16 [cited 2022 Jul 25]; [about 6 screens]. Available from: <a href="https://health.clevelandclinic.org/fasting-before-blood-test" target="bibliowin">https://health.clevelandclinic.org/fasting-before-blood-test</a></li>
<li>DeWaters AL, Mejia D, Thomas J, Elwood B, Bowen ME. Patient Preparation for Outpatient Blood Work and the Impact of Surreptitious Fasting on Diagnoses of Diabetes and Prediabetes. Mayo Clin Proc Innov Qual Outcomes. 2020 Jun 20 [cited 2022 Jul 25];4(4):349-356. doi: 10.1016/j.mayocpiqo.2020.04.002. PMID: 32793862; PMCID: PMC7411170. Available from: <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7411170/" target="bibliowin">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7411170/</a></li>
<li>National Heart, Lung, and Blood Institute [Internet]. Bethesda (MD): U.S. Department of Health and Human Services; Blood Tests; [updated 2022 Mar 24; cited 2022 Jul 25]; [about 8 screens]. Available from: <a href="https://www.nhlbi.nih.gov/health-topics/blood-tests" target="bibliowin">https://www.nhlbi.nih.gov/health-topics/blood-tests</a></li>
<li>Quest Diagnostics [Internet]. Quest Diagnostics; c2022. Fasting for Lab Tests; [cited 2022 Jul 14]; [about 3 screens]. Available from: <a href="https://www.questdiagnostics.com/patients/get-tested/prepare/fasting" target="bibliowin">https://www.questdiagnostics.com/patients/get-tested/prepare/fasting</a></li>
<li>Testing.com [Internet]. Seattle (WA): OneCare Media; c2022. Lipid Panel; [modified 2021 Nov 9; cited 2022 Jul 14]; [about 5 screens]. Available from: <a href="https://www.testing.com/tests/lipid-panel/" target="bibliowin">https://www.testing.com/tests/lipid-panel/</a></li>
<li>Testing.com [Internet]. Seattle (WA): OneCare Media; c2022. Test Preparation: Your Role; [modified 2021 Jun 6; cited 2022 Jul 14]; [about 14 screens]. Available from: <a href="https://www.testing.com/articles/laboratory-test-preparation/" target="bibliowin">https://www.testing.com/articles/laboratory-test-preparation/</a></li>
<li>University of Rochester Medical Center [Internet]. Rochester (NY): University of Rochester Medical Center; c2022. Health Encyclopedia: Cholesterol in the Blood; [cited 2022 Jul 14]; [about 6 screens]. Available from: <a href="https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=85&amp;contentid=P00220" target="bibliowin">https://www.urmc.rochester.edu/encyclopedia/content.aspx?contenttypeid=85&amp;contentid=P00220</a></li>
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