The patient must present with a full bladder. 1  2hrs prior to the appointment, the patient should empty their bladder. 2  Over the next hour they should drink at least 1 litre of water. This allows time for the water to reach the bladder. 3  Do not go to the toilet until instructed by the Sonographer.
It is important to get the Rhogam shot if you are a negative blood type and your significant other is a postive. Negatuve blood type is a recessive trait, therefore its highly likely your baby will have a postivie blood type. A negative blood type means your blood cells lack a protien coating.
You are referring to the RH factor which makes the blood type positive or negative. I'm not sure of the order if the mom's negative and the baby's positive blood type that could lead to issues. I think it's the mom being negative. So if thisi s the situation for you, they give you a shot of Rhogam and you're fine.