Which syringe type is least suitable for administering large amounts of fluids?

The 1 mL syringe is least suitable for administering large amounts of fluids due to its limited capacity. When a large volume of fluid is required, using a syringe with a small capacity like the 1 mL can lead to multiple draws and injections, which is inefficient and can cause discomfort to the patient. Additionally, a smaller syringe may not provide accurate measurements for larger volumes, increasing the risk of dosing errors.

In contrast, syringes such as the 3 mL, 5 mL, and 12 mL options can accommodate larger volumes, making them more appropriate for situations where a significant amount of fluid needs to be administered. These larger syringes allow for a single or fewer injections, improving the efficiency of the procedure and minimizing patient discomfort.