The nurse is explaining to a new prenatal patient that the certified nursemidwife will perform ...

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Rationale 1: Clinical pelvimetry is an estimate of the diameter of the pelvis the baby fits through during birth. The estimated size of the pelvis helps estimate what size fetus the patient can deliver vaginally.
Rationale 2: Although this is a true statement, the estimation of the pelvis size is a better indication of the patient's understanding.
Rationale 3: Knowing that the patient's sister had her babies by cesarean would not indicate that the patient understood the teaching.
Rationale 4: Clinical pelvimetry is done with the first pregnancy, but the patient's stating that this is her first child does not indicate that the patient understood the teaching.