Final answer:
An 18G needle is typically recommended when starting an IV on a woman admitted for Placenta Previa, due to the need for potential rapid administration of fluids or blood products in case of hemorrhage.
Step-by-step explanation:
If you were told to start an IV on a woman admitted for Placenta Previa, the choice of gauge needle would typically be based on the medical situation and the specific needs for infusion therapy. In a case of Placenta Previa, where there is a risk of hemorrhage, a larger bore needle is oftentimes required to ensure rapid administration of fluids or blood products if needed. Thus, the most appropriate choice in this situation would usually be:
An 18G needle is generally used in situations where larger volumes of fluid may need to be administered quickly. Its larger diameter allows for rapid infusion rates, which is critical in managing acute blood loss. However, it's crucial to always follow hospital protocols and the orders of the attending physician when initiating IV therapy.