No. Because of that, I wasn't able to donate that day. Avoid exercise for a few days before your PSA test. Sudden decreases in blood sugar level also cause fainting during blood donation. A Verified Doctor answered. “It can be a very mild diuretic at times, so that’s probably not a good thing,” Gottschall said. If you're wondering whether or not you can have coffee before a blood test, ask your doctor if you need to fast. One thing to avoid before donating: caffeine. By eating and drinking certain foods, a person can help their body recover. World Blood Donor Day … The blood contains iron, and each donation … If you're wondering whether or not you can have coffee before a blood test, ask your doctor if you need to fast. Updated: 17 Jun 2013, 07:45 PM IST Kavita Devgan. Iron. Before donating blood, just keep in mind to drink lots of fluids more than you normally drink on the day that you plan to donate your blood. She suggested that I start drinking Powerade or Gatorade at least 48 hours before donating blood, as the salt in those drinks can help expand small veins like mine. Consume … Coffee would not be the way they want you to take fluids, but that, juice, water etc would be fine. Well, Hell,no! Typically before a blood test, they want you to be well hydrated. Preparing for your blood donation boils down to taking good care of yourself. Yes, you can drink coffee. why can't you drink coffee after donating plasma & what are the effects if you do? I stopped by Starbucks on the way to work right after that and got a 16oz Christmas Blend coffee (very good btw). Even bicycling, riding motorcycles or ATVs, or riding horses have been shown to elevate PSA slightly for a short period of time.. Can I have sex before I take a PSA test? This morning I gave blood and they didn't tell me anything about what to eat or drink after. A cup of coffee usually has about 7000 chemicals. 1 doctor answer. During the blood collection process, blood volume decreases, causing a sudden drop in blood pressure. This sudden drop causes some people to pass out while they give blood. To help prevent this from happening we ask you to drink 500ml of water immediately before you donate - we’ll give this to you before you donate. Learn More. Fasting tests restrict everything but water. If they gave you any instructions, follow them. Almost half of the blood that you donate is made up of water. That doesn’t mean you should chug coffee before giving blood. I'm usually one of those guys who can drink a whole pot of coffee and not really feel any effects from the caffeine. Can You Drink Coffee Before Donating Blood? Eat before and after blood donation to avoid fatigue Dos and don’ts of blood donation 3 min read. Donating blood lowers levels of key nutrients the body. I was just diagnosed with hashimoto's and now I think I have celiac. 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