What should be monitored in a patient suspected of having a persistent placenta?

Monitoring hemoglobin levels in a patient suspected of having a persistent placenta is essential due to the potential for significant blood loss and the risk of hemorrhage that can occur with retained placental tissue. A persistent placenta, whether due to incomplete placental delivery or adherence to the uterine wall (such as in cases of placenta accreta), can lead to maternal complications, including severe anemia from excessive bleeding. Therefore, assessing hemoglobin levels helps in evaluating the patient's overall blood volume and oxygen-carrying capacity, guiding appropriate management and interventions.

In contrast, while monitoring urine output, fetal heart rate, and gestational age are important in various clinical scenarios, they do not directly address the immediate concerns associated with a suspected persistent placenta. Urine output is more relevant for evaluating renal function and fluid balance, the fetal heart rate is crucial for assessing fetal well-being, and gestational age is important for overall pregnancy management but does not provide insight into the complications arising from a retained placenta.