What position should the nurse have the client in when measuring fundal height at 30 weeks of gestation?

When measuring fundal height at 30 weeks of gestation, having the client lie on her left side is the preferred position. This position enhances the accuracy of the measurement because it helps to alleviate pressure on the major blood vessels, such as the inferior vena cava, which can be compressed when the patient is supine. This compression could lead to a decrease in venous return and potentially affect blood pressure and uterine position, which can interfere with the precision of fundal height measurement.

The left side position is particularly beneficial as it promotes optimal blood flow to both the uterus and the fetus, giving a better representation of the right fundal height. This position also allows for a comfortable and relaxed assessment for the mother, facilitating a more accurate examination by the nurse.