Can anyone tell me? I'm not getting on with my midwife and although I know she is going to take blood tomorrow (not GTT) she will only reply "it's normal to take it at 28 weeks" and shrugs me off. Can any ladies tell me what it is testing for and how many viles they take? If i know what it's for and how many viles I can face it, pace myself and get through it fine. I'm pacing up and down here can anyone help?