Final answer:
The laboratory test findings suggest the pregnant woman with preeclampsia is experiencing HELLP syndrome, a complication requiring immediate attention to ensure both maternal and fetal safety.
Step-by-step explanation:
Based on the laboratory test findings showing a platelet count of 90,000, elevated aspartate transaminase (AST) level, and a falling hematocrit in a pregnant woman with preeclampsia whose labor is about to be induced, the nurse is correct to notify the physician. These lab results are indicative of HELLP syndrome, a serious complication of high blood pressure during pregnancy, characterized by Hemolysis, Elevated Liver enzymes, and Low Platelet count. Notifying the physician is crucial for the immediate management of this condition to ensure the safety of both the mother and the unborn child.