Since 2007 my mch, mcv, hct, hgb, and baso tests have come back low. now my rdw is high, potassium is low and crp level has doubled. why?

Need more info: You definitely need to discuss with your doctor who ordered those test to give an interpretation of the blood work result.What i can say here is that if you have low hb/hct and MCV and now RDW is high- that means you have anemia- and you should have some eval to find the etiology of anemia- likely is iron deficiency- but also some other etiologies have to be ruled out. F/u with your md and d/w md.

Depends : Depends on how low the values are. Some people especially mensurating women may have slightly lower HGB MCV and high rdw.