Which of the following is NOT a step in ordering a TPN?

When considering the steps involved in ordering Total Parenteral Nutrition (TPN), it is essential to focus on activities that contribute to effectively initiating and managing the TPN process. Among the options provided, requesting an imaging test is not part of the standard procedure for ordering TPN.

Ordering TPN typically begins with accessing order sets designed for nutritional support and includes ensuring that patient care decisions are driven by available clinical data. This is where reviewing progress notes and current labs becomes critical, as it ensures that the healthcare provider has a comprehensive understanding of the patient's current health status and nutritional needs.

Additionally, filling in clinically appropriate information next to the hard stop for Pharmacy ensures that all necessary parameters are met before the TPN can be safely administered. This reinforces the importance of careful planning and coordination in providing nutritional care.

In contrast, ordering an imaging test does not directly relate to the TPN order process. Imaging tests are typically employed for diagnostic purposes or to monitor conditions unrelated to the immediate ordering of TPN.