Families today face challenges that yesterday's laws simply don't address. We need to fix government, and one solution is to update our laws so they provide America's families with more freedom in their jobs; greater healthcare and retirement security; safer communities; access to quality, affordable education; and the ability for future generations to compete in the global economy.

This week, my colleagues announced the American Families Agenda. This new agenda concentrates on the bread and butter issues facing every American. And it recognizes that today, more and more families struggle with balancing work, children and caring for elderly parents. Over the coming weeks, we will be promoting new ideas that give people more personal freedom and lessen the burden of government.

From young people just starting out and looking for affordable college, to working parents who want more freedom in the workplace, to seniors who would benefit from greater flexibility with their health care and prescription drug benefits, the American Families Agenda provides commonsense solutions that modernize our laws and give people greater liberty.

I look forward to sharing more about solutions and a positive agenda in the weeks to come.

The separation of individual blood components is done with a specialized centrifuge (see apheresis). The earliest manual forms of plateletpheresis are done by the separation of platelets from multiple bags of whole blood collected from donors or blood sellers. Since each blood bag (usually 250 ml or 500 ml) contains a relatively small number of platelets, it can take as many as a dozen blood bags (usually from 5 to 10 bags, depending on the size of the blood bags and each donor's platelet count) to accumulate a single unit of platelets (enough for one patient). This greatly increases the risks of the transfusion. Each unit of platelets separated from donated whole blood is called a "platelet concentrate".

Modern automatic plateletpheresis allows the blood donor to give a portion of his platelets, while keeping his or her red blood cells and at least a portion of blood plasma. Therefore, no more than three units of platelets are generally harvested in any one sitting from a donor. Most donors will donate a "single" or "double" unit, however the occurrence of "triples" has been increasing as more suitable donors are recruited.

Because platelets have a life-span of just 5 days, more platelet donors are always needed. Some centers are experimenting with 7 day platelets, but this requires additional testing and the lack of any preservative solutions means that the product is far more effective when fresh.

Even though red blood cells can also be collected in the process, most blood donation organizations do not do so because it takes much longer for the human body to replenish their loss. If the donor donates both red blood cells and platelets, it takes months, rather than days or weeks, before they are allowed to donate again (the guidelines regarding blood donation intervals are country-specific).

In most cases, blood plasma is returned to the donor as well. However, in locations that have plasma processing facilities, a part of the donor's plasma can also be collected in a separate blood bag (see plasmapheresis).