Final answer:
The nurse should report a neutrophil count of 1900 cells per microliter to the provider as it indicates a weakened immune system.
Step-by-step explanation:
The nurse should report a neutrophil count of 1900 cells per microliter to the healthcare provider. Neutrophils are a type of white blood cell that plays a vital role in fighting off infections. A low neutrophil count can indicate a weakened immune system, which can be concerning for a patient receiving chemotherapy. The healthcare team will need to evaluate whether it is safe to proceed with the chemotherapy treatment, as a low neutrophil count increases the risk of developing infections.