how long do i need to fast for a psa blood test?
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The authors recommend that the optimal time to obtain an accurate PSA level is fasting for 7–9 h, which avoids the increased PSA levels observed with fasting extremes as well as possible diurnal rhythm variations that may exist in shorter fasting times. This is an interesting study with meaningful results.
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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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You may need to test your blood several times a day. Generally, these times are fasting (first thing in the morning before you eat) and 2 hours after each meal. Occasionally, you may be asked to test more frequently during the day or at night.
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For this test you will need to fast for 8 hours before test. When you arrive at the lab or health care facility, you will: Have your blood tested. Drink a special liquid containing glucose.
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You may be instructed not to eat or drink anything except water for 9 to 12 hours before having your blood drawn. This is called a "fasting blood test." Fasting is not always necessary, but it may be recommended. Usually, you are allowed to take your medicines with water the morning of the test.
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Ejaculation causes a significant increase in the serum PSA concentration in men between 49 and 79 years of age that may persist for up to 48 hours. This change appears to correlate with age and baseline PSA. It is recommended that men abstain from ejaculation for 48 hours prior to having a serum PSA deter- mination.
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Fasting is required for a period of 8-10 hours prior to the test. (No food or fluids such as tea, coffee or fruit juice.) You may have sips of water if you are thirsty. Due to the nature of the test, testing is generally done in the morning.
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You may be instructed not to eat or drink anything except water for 9 to 12 hours before having your blood drawn. This is called a "fasting blood test." Fasting is not always necessary, but it may be recommended.
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The amount of PSA in your blood is measured in nanograms of PSA per millilitre of blood (ng/ml). If you're aged 50 to 69, raised PSA is 3ng/ml or higher. A raised PSA level in your blood may be a sign of prostate cancer, but it can also be a sign of another condition that's not cancer, such as: an enlarged prostate.
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A quick guide to fasting Fasting means that you abstain from all food and fluids other than water for a period of 8-14 hours prior to your test.
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You will usually need to fast (not have any food and only drink water) for between 9 and 12 hours before having this test. Most people have the test in the morning so it doesn't interfere with their day and their meals.
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What to know about fasting before your lab test. 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. Don't wait until the day of your blood draw to ask if you should fast.
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Blood for testosterone should be collected in the morning at about 08:00 hours and in the fasting state. Repeat measurements should be made if results are low or borderline before making a diagnosis.
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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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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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The prostate health index (PHI) is one such test that is a more accurate blood test and measures your risk for having prostate cancer. It's approved by the FDA for men who have PSA scores between 4 and 10.
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Obtain fasting labs (nothing by mouth except water for 8 hours prior to test) 1-2 days prior to monthly visits. If labs are not reviewed in the office, you will be contacted in 2-3 days with your results and prescription information.