Baseline data are defined as which of the following?

• A. Data collected after pharmacotherapy begins.
• B. The patient’s family history only.
• C. Information gathered before pharmacotherapy is implemented.
• D. Data collected during discharge planning.

Answer: (C)

Baseline data are the information collected prior to starting a drug therapy. This initial snapshot includes vital signs, laboratory values, organ function, allergies, current medications, medical history, and functional status. Having this pre-treatment information allows you to compare later data to determine whether the drug is producing the desired effects, identify adverse reactions, and adjust dosing safely. Data gathered after therapy begins, during discharge planning, or limited to a single domain like family history do not serve as the baseline reference.