do you need to fast for potassium blood work?
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You don't need any special preparations for a potassium blood test or an electrolyte panel. If your health care provider has ordered more tests on your blood sample, you may need to fast (not eat or drink) for several hours before the test.
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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.
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Taking 3,700mg or less of potassium supplements a day is unlikely to have obvious harmful effects. But older people may be more at risk of harm from potassium because their kidneys may be less able to remove potassium from the blood. Older people shouldn't take potassium supplements unless advised to by a doctor.
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Common fasting blood tests Examples of blood tests that require you to fast include: a fasting blood glucose test (used to test for diabetes) – you fast for 8 to 10 hours before the test. an iron blood test (used to diagnose conditions such as iron deficiency anaemia) – you fast for 12 hours before the test.
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Your doctor will ask you to come for a blood test in the morning and they will explain that you should not eat anything before having this test, as the test needs to be done after you have fasted.
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As kidneys become less able to remove potassium from your blood, too much potassium may build up. Often, like high blood pressure, there aren't many symptoms of high potassium (hyperkalemia). Feeling sick to your stomach, a low, weak or irregular pulse and fainting may occur with high levels of potassium.
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Basic or comprehensive metabolic tests: Tests for blood sugar, electrolyte balance, and kidney function. Typically, people will be asked to fast for 10 to 12 hours before having one of these tests. Renal function panel: Tests to see how well the kidneys are working.
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With certain blood tests, you may be instructed to fast for up to eight hours before your appointment. Fasting before a blood draw means you don't eat or drink anything except water.
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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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How long do I have to fast before the test? You usually need to fast for 8–12 hours before a test. Most tests that require fasting are scheduled for early in the morning.
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Potassium can build up in the blood in people who have kidney failure. This causes problems with how the heart works. You will need to limit the amount of potassium you take in each day. Do not eat high-potassium foods, such as potatoes, tomatoes, citrus fruits, avocados, bananas, and dried fruit.
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The amount of time you need to fast for will vary depending on the test. For most tests, you will be told not to consume anything but water for eight hours leading up to the test. For a few tests, a 12-hour fast may be needed.
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Should the patient fast before the appointment? For a physical, my staff advises patients to fast eight hours prior to the appointment for the bloodwork. Water and a cup of black coffee is fine if you usually drink it in the morning, though.
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Tell your doctor about any prescription or over-the-counter medications or supplements you're taking. You may need to fast (refrain from eating or drinking) for four hours before the test.
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Fasting before a blood draw means you don't eat or drink anything except water. Don't wait until the day of your blood draw to ask if you should fast. That could cause your appointment to be rescheduled. If at any point you're unsure if fasting is required, contact your doctor.
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Why You Need Potassium For starters, it helps your blood pressure. It does this in two different ways: First, with the aid your kidneys, potassium helps remove extra sodium from your body through your urine. This is a good thing, because too much sodium can cause high blood pressure.
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a fasting blood glucose test (used to test for diabetes) – you fast for 8 to 10 hours before the test. an iron blood test (used to diagnose conditions such as iron deficiency anaemia) – you fast for 12 hours before the test.