Which item is NOT a Patient Specimen?

The correct response is a sealed glass vial of water, as this item does not qualify as a patient specimen. Patient specimens are biological materials that are collected from individuals for the purpose of diagnostic testing and analysis. Blood samples, tissues for testing, and excreta are all integral parts of medical investigations related to human health and are collected from patients to diagnose conditions, monitor health, or perform scientific research.

A sealed glass vial of water, on the other hand, does not originate from a patient or represent any biological material relevant to patient care or diagnostics. It is simply a container of water and has no significance in the context of clinical testing or health assessment. Thus, it stands apart from the other options that inherently involve human biological samples.