<prompt> Rains factor is used for measurement of blood loss in operations or minor procedures . It isTotal difference in swab weight x 0.5Total difference in swab weight x 1.5Total difference in swab weight x 2.5None of the above  <response>: Rains factor Total amount of blood loss Total difference in swab weight x 1.5 Or Total difference in swab weight x 2 for larger wounds or operations Ref : Srbs manual of surgery p 120 