While changing the dressing of a client who is immobile, the practical nurse (PN) observes a red and swollen wound with a moderate amount of yellow and green drainage and a foul odor. Before reporting this finding to the healthcare provider, the PN should evaluate which of the client's laboratory values?

A. C-reactive protein level is a general marker for inflammation and can indicate infection, but it does not provide specific information about the wound infection. B. Serum albumin is important for assessing nutritional status and wound healing potential, but it does not directly address the acute issue of a possible wound infection. C. Serum blood glucose level is significant, especially in clients with diabetes, as high glucose can impair healing and increase infection risk. However, it does not directly provide information about the infection itself. D. Culture for sensitive organisms is the most relevant lab value to evaluate before reporting to the healthcare provider. It identifies the specific pathogens causing the infection and guides appropriate antibiotic treatment.