yes, you need to do these tests. A blood test and a urine test will cover them.
For example, if your blood sugar (glucose) level is higher than normal during pregancy, you might need to control your carbohydrates (rice, bread, suger,etc.) intake. If you are diabetic 1, you need insulin injection.
Creatinine is a chemical natrually existing in our body. Its test tells if your kidneys function well. Your kidneys have a double duty during pregnancy. Not only does it response to get rid of your own body waste, but also your baby's. It could be toxic if waste is unable to be excreted.
hemoglobin test gives a value of your hemoglobin count. Hemoglobin is made of iron which is the functioning element in each red blood cell for carrying oxygen. If the count is low, your doctor might prescribe you some iron pills.
Rubella test is to see if you are immune. If you are not, and you get this viral infection during pregnancy, there are risks of premature labor, miscarriage and birth defects.
Rh test is a “blood type” test. It is looking for a certain antigen on mother’s red blood cells. Most people have this antigen, they are called Rh positive. A few don't, and they are Rh negative. If you don't have it, and your baby has it, you will go through a whole medical procedures to protect the fetus. Since your immune system will initiate antibodies to attack the baby's red blood cells and in some severe cases, it could cause fetal death.
These information might sound overwhelming to you. However, the point is to be aware of the importance of these tests.
They are there for some reasons and you can not overlook them. Hopefully, it helps you understand these tests.