What are the rules for Washing after Haircuts and or Shaving and or is there a requirement at all? Also after donating blood is there a requirment to Wash hands and or a blood test and is there a difference between them foe washing meaning are they both similar to Letting blood in Talmudical Times and hence require washing or not?
Regarding blood-letting, while there are those who are accustomed to washing their hands after giving blood (either to be tested, or for donation), Rav Shlomo Zalman Auerbach (cited by the Nishmat Avraham 4) believed that "blood-letting" referred to a specific medical procedure in which the bleeding was beneficial to the patient. Since giving blood, even for a blood test, is not for direct healing purposes, one is not required to wash one's hands.
Regading haircuts see this link. http://www.dailyhalacha.com/Display.asp?PageIndex=88&ClipID=1599
In Shaalos U'Teshuvos Divrei Chachomim he brings in the name of HaRav Moshe Feinstein Zatzal that you do not have to wash your hands after shaving.