On admission, the healthcare provider prescribes a broad spectrum antibiotic for a client with a gram-negative infection. Before administering the first dose, it is most important for the nurse to implement which prescription?

A) Irrigation and topical antibiotic application to wound area: While wound care is important in managing infections, obtaining cultures before initiating antibiotic therapy takes precedence to ensure appropriate treatment. Topical antibiotics may not adequately address systemic infections caused by gram-negative bacteria. B) Monitor for signs of sodium and fluid retention: This intervention is important when administering certain antibiotics, such as those in the aminoglycoside class, but it is not the most immediate priority. Monitoring for signs of sodium and fluid retention is typically indicated after antibiotic therapy has commenced and involves assessing the client's clinical status and laboratory values for signs of electrolyte imbalance or fluid overload. C) Wound and blood specimens for culture and sensitivity: This action is essential before initiating antibiotic therapy because it allows for the identification of the specific organism causing the infection and its susceptibility to antibiotics. This information guides the selection of the most appropriate antibiotic for targeted therapy, improving treatment efficacy and reducing the risk of antibiotic resistance. D) Complete blood count and serum electrolytes: While monitoring laboratory values is important in the overall management of the client, obtaining cultures for culture and sensitivity testing is the priority before initiating antibiotic therapy. This step helps ensure that the chosen antibiotic is effective against the specific pathogen causing the infection.