If it's a fasting blood test, you'll need to avoid eating and drinking (except water) for a period of time before the test is performed. Your doctor will give you this information ahead of the test. For example, if you're being tested for blood glucose, lipid profile or iron levels you may need to avoid eating and drinking beforehand, Dr Lee says.

Men who avoided eating spicy foods, drinking alcohol or coffee, and riding a bicycle had a repeat PSA reading approximately 1.5 ng/mL lower than their first reading a median of 8 weeks earlier.
Can I eat and drink before the biopsy? Yes, you can eat and drink before the biopsy. Should I take my usual medication on the day of the biopsy? Most medicines can be taken as usual, but some medicines need to be stopped. Anticoagulants If you take warfarin, this should be stopped 5 days before your biopsy. You should have an INR check the day
A continuous rise: PSA levels that continue to rise after two or more tests may mean you have cancer. But the PSA level alone doesn’t determine if you have cancer or not. Two men can even have the same PSA levels but different risks of prostate cancer. And a high PSA level may reflect prostate problems that aren’t cancer. Exam time: approximately three to four hours. Consult your physician about going off beta blockers for 48 hours and calcium channel blockers for 24 hours before the test. Consult your physician before discontinuing ANY medication (especially if diabetic). Do not eat or drink three hours prior to your exam. The Prostate Specific Antigen (PSA) test. This blood test measures the amount of prostate specific antigen—a protein that is produced by both normal and malignant prostate gland cells—in your blood. Higher PSA levels may indicate prostate cancer, but a PSA test is used to determine if further testing, including a biopsy, is needed. WQx2PP.
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