Final answer:
The nurse is trying to improve the accuracy of blood loss estimation.
Step-by-step explanation:
The nurse is trying to improve the accuracy of blood loss estimation. Blood loss estimation is often subjective, but by soaking several perineal pads and observing the amount of blood absorbed, the nurse can make a more objective assessment. This helps in accurately monitoring and managing postpartum hemorrhage or any other condition where blood loss needs to be measured.