What is the maximum fullness recommended for a syringe to prevent accident dislodgement of the plunger?

The maximum fullness recommended for a syringe, which is 3/4 full, is based on the need to balance adequate medication volume with ease of plunger manipulation and safety during administration. When a syringe is too full, there is an increased risk that the pressure exerted during use could inadvertently dislodge the plunger, particularly if excessive force is applied. A syringe that is only slightly full can make it difficult to draw up the desired amount of liquid accurately and may also result in air being introduced into the medication.

By filling the syringe to 3/4, the technician ensures there is enough volume for the dose while still allowing enough space to maneuver the plunger comfortably, providing better control during the injection or administration process. This level of fullness supports safe and accurate dispensing and reduces the risks of mechanical failure during medication delivery.