We were told there are other blood banks on the island, but the only place I am familiar with is the main 'free' hospital (Luis Ortega) downtown Porlamar. Another place mentioned was Bolivariana.

Update: Dec 2010
A friend of mine decided he would like to donate blood last October, so he took a translator with him to El Valle and asked to donate. They had him fill out quite a bit of paperwork, and asked him who he was donating blood for, then checked his hemoglobin to make sure his level was high enough to be safe for him to donate.

His hemoglobin was good, so they went ahead with the procedure. But then they told him that they would test his blood for HIV and other sexually transmitted diseases, and if all those tests came back negative then his blood would be released for use. He was told he could pick up his test results the following week. When his test results were obtained it was discovered the blood bank had also tested for chagas. Now, Chagas disease is an infection with Trypanosoma cruzi transmitted by Triatominae bug bites. This bug is nicknamed the "Kissing or Assassin Bug", and the end result of the disease can be death. This bug is prevelant in North, South and Central America and can be transmitted by blood transfusion, as well as other means, so hense the reason for testing when donating blood.

Now, my friend decided he would return and donate again 3 months later. The blood bank had given him a 'Donation' card with his blood type, test results and date of last donation on it, so he thought that was all he would need for a repeat donation. But, as it turned out they made him fill out all the same paperwork, and they tested him again for all the same things. When he questioned them on this they told him that it was possible for people to contract all these same diseases between blood donations, so they test each time. And as for the repeat paperwork...well, in this country clinics, hospitals and doctor's offices do not store patient information, it is sent home with the patient and they are responsible to bring it with them at each visit. I have noticed that some doctors, Dr. Cogorno and Dr. Bonmati, do use a laptop to keep track of their patients, but there are no paper trails in the offices.