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1. Why should I donate blood?

   Every year, about 4.5 million American lives are saved with blood transfusions, while an estimated 38,000 units-5,000 gallons-of donated blood are used each day in the U.S. Yet the country's blood supply runs on perilously thin margins.

2. Why isn't there enough blood?

   Several reasons. The World War II generation, which has always been the greatest donor of blood products, is getting older and fewer. Subsequent generations simply haven't taken up the call to donate. Today, just five percent of Americans donate blood, even though 60 percent are eligible.

3. Who can donate blood?

   The criteria are comprehensive, covering everything from the type of medication you're taking to any illnesses past or current. Briefly, you must be 17 or older to donate blood and weigh at least 110 pounds. You cannot donate if you have ever tested positive for HIV or Hepatitis B or C, or have a clotting disorder or a generalized autoimmune disease, including lupus and multiple sclerosis.

4. Are there certain medications that disqualify me from donating blood?

   Most medications do not interfere with your ability to donate blood, although some require that you be finished taking the medicine for several days before donating. You cannot donate blood if you have ever taken Tegison (etretinate) or human pituitary-derived growth hormone.

5. If I have traveled in the United Kingdom, can I still donate blood?

   Not if you've spent three months or more cumulatively in the UK between 1980 and 1996.

6. Will I have a reaction after donating blood?

   A few people may experience some nausea and dizziness, and may notice a bruise, redness or swelling at the injection site.

7. May I still donate when I'm menstruating?

   Absolutely, as long as you feel ok.

8. Do I need to make any special preparations prior to donating?

   Yes. You should eat and drink heartily the day of your donation, and refrain from exercising. You should wear comfortable clothing and bring a picture ID to the donation site.

9. What should I do if I discover that I have a transmissible virus after I've already donated blood?

   Call the blood center where you donated blood immediately.

10. Do I have to know my blood type before donating?

    No. The blood center will test your blood to determine its type.