Why do they make you pee in a cup everytime you go to the doctor when youre pregnant?

Evaluating for Pre-E. The reason we test urine each time you visit during pregnancy is to evaluate for a condition called pre- eclampsia. Pre-eclampsia is a condition in pregancy associated with high blood pressure that can lead to damage to other organs, such as the kidneys. A urine test can let your physician know if you have signs of pre-eclampsia. However, this test is only part of the diagnosis (bp, headache, pain.
Various reasons. Urine test is performed in pregnant women because one wants to make sure there is not an urinary infection, sugar in the urine, or protein in the urine. These can all be detected by an urine dipstick. Proteinuria may be associated with serious complications. So an obstetrician will want to know of these findings as soon as possible. Therefore an urine test is done at each pregnancy visit.