In some anemias, such as pernicious anemia, the amount of variation (anisocytosis) in RBC size (along with variation in shape - poikilocytosis) causes an increase in the RDW.   The CBC is used as a broad screening test to check for such disorders as anemia, infection, and many other diseases.
Obtaining a Travel Authorization Number A Travel Authorization Number (T-Number) is required for those employees where a local rule applies and for all non-employee travel. It is needed for all travel involving an overnight stay or the purchase of an air, rail, or bus ticket.
1 Fill out your application and collect your documents. See How to Apply. 2  You must make an appointment and show proof of international travel to apply at a passport agency or center.  Call 1-877-487-2778 or 1-888-874-7793 (TDD/TTY) to schedule an appointment.