The nurse should discard the catheter and collection system after a patient's foot touches the sterile field and start with a new kit. This ensures proper sterility is maintained, reducing the risk of infection. The correct choice is C.
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When a patient's foot touches the sterile field during catheter insertion, the nurse should discard the contaminated equipment and start with a new sterile kit to ensure patient safety and prevent infection. Maintaining sterility is crucial in these procedures. Other options to proceed would not effectively manage the contamination. ;