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When assessing a pregnant woman, placing her in the left lateral position with a slight roll of 15-30 degrees is recommended to optimize maternal and fetal circulation. This position helps to alleviate pressure on the inferior vena cava, which can be compressed when a pregnant woman is in a supine position (lying on her back). By rolling her slightly to the left, blood flow back to the heart is improved, enhancing oxygen delivery to both the mother and the fetus.

This position is particularly important during the third trimester when the weight of the uterus can exert pressure on major blood vessels. Additionally, achieving this angle helps facilitate better respiratory function for the mother.

Other positions, such as lying supine or in a prone position, are not recommended because they can compromise venous return and may lead to decreased perfusion to the fetus. While the right lateral side is a potential option, medical guidelines predominantly favor the left lateral side for optimal outcomes during assessments.