Question

a pharmacy technician should recognize that which of the following components must be on a unit dose label?
national drug code (ndc) number
refills
lot number
date filled

Explanation:

To determine the correct component for a unit - dose label:

1. Analyze "National Drug Code (NDC) number": The NDC number is used for drug identification in a broader sense, but it's not a mandatory component of a unit - dose label.
2. Analyze "Refills": Refills are related to the prescription for the entire medication supply, not a unit - dose label. A unit - dose label is for a single dose, and refills don't apply here.
3. Analyze "Lot number": A lot number is crucial for a unit - dose label. It helps in tracking the batch of the drug from which the unit dose is derived. This is important for quality control, recall purposes, and ensuring the integrity of the medication.
4. Analyze "Date filled": The date filled is related to when the entire prescription was filled, not a single unit - dose. A unit - dose label focuses on the individual dose, and the date filled of the prescription is not a part of it.

Answer:

Lot number