Like a PP suggested, maybe it depends on the machine. Sue I think both are probably right, but when I had my scan 2 days ago, the midwives actually did a urine protein test right before my scan, so I had to go to the toilet. I followed the water drinking/not peeing instructions to the letter and when I went in for my scan (this was my 12 wk one) they made me pee it all out because bub was really unconfortable and couldnt get it to stop moving to get a good reading.
They told me I didn't need any water prior to the scan, and I am still very early. They seemed to be able to get a reading fine without a full bladder.
The scan is carried out by a sonographer and the images recorded and interpreted to make a diagnosis. Please arrive at the clinic 15 minutes before your appointment. You will be greeted by a Clinical Assistant and/or a Sonographer and asked to sign a data sharing consent form.If you are likely to require a transvaginal, transrectal or testicular scan you will be asked to give written consent as this is an intimate examination.The examination will be explained to you prior to consent.Pregnancy scans can be performed from the early dating / viability phase to growth and presentation (positional) scan in the later stage.Not only can they be the most magical time for parents, but they can provide you, and the midwife, with essential & valuable information about the health, wellbeing and development of your baby.