Final answer:
A positive urine pregnancy test is usually followed by a blood test for a qualitative beta HCG, confirming the pregnancy. The control line in a urine test confirms the validity of the test, while the test line indicates pregnancy if positive. The umbilical artery carries deoxygenated blood away from the fetus.
Step-by-step explanation:
The statement, "If a preoperative urine pregnancy test is positive then a qualitative beta HCG should be drawn through peripheral blood draw and sent to lab for stat testing," is True. A positive preoperative urine pregnancy test typically leads to a blood test to confirm pregnancy with a quantitative beta HCG (human chorionic gonadotropin) level. This hormone is produced by the cells of the placenta and is a marker used to confirm a pregnancy. A qualitative beta HCG from a blood draw provides a simple positive or negative result, while a quantitative test measures the specific levels of HCG and can give more precise information about the pregnancy, such as gestational age.
A urine pregnancy test utilizes a lateral-flow method to detect the presence of HCG. A control line appears to verify that the test is working properly, and a test line appears if HCG is detected, signaling a positive test for pregnancy. If a blue band forms on the control line and no band on the test line, it indicates a negative test result.
Regarding fetal development, it is True that a fetus can produce urine, and the umbilical artery, contrary to its name, actually carries deoxygenated blood away from the fetus to the placenta where gas exchange occurs.