Which is an essential element on infusion labels for parenteral solutions?

An essential element on infusion labels for parenteral solutions is the inclusion of ancillary precaution labels. These labels are vital for ensuring the safety and proper administration of the infusion. They provide important information regarding potential risks, warnings, and any specific handling instructions necessary for the safe use of the product. This can include details about drug interactions, administration protocols, and monitoring parameters that healthcare professionals need to observe.

In contrast, the other options do not fulfill a similar critical role in the context of infusion labeling. A physician's contact number, while useful for communication, is not a standard requirement on medication labels. Similarly, a patient's family history does not pertain to the medication itself but rather to patient medical records and assessments. Lastly, a social security number is personal information that is not relevant to the labeling of medications and could violate privacy regulations. Therefore, ancillary precaution labels are necessary to maintain safe practices in the administration of parenteral solutions, making them the correct choice.