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When intravenous solutions are prepared, end-product testing involves:

  1. Checking for isotonicity

  2. Having the laboratory check one of the solutions for molarity

  3. Visually inspecting the compounded solution for particulate matter

  4. Having a pharmacist monitor the entire procedure

The correct answer is: Visually inspecting the compounded solution for particulate matter

In intravenous solution preparation, end-product testing involves visually inspecting the compounded solution for particulate matter. This step is crucial to ensure that the solution is free from any visible particles that could potentially cause harm if administered intravenously. Particulate matter can lead to emboli, which can block blood vessels and cause serious complications if introduced into a patient's body. Therefore, this visual inspection is a critical quality control measure to guarantee the safety and efficacy of the intravenous solution prior to administration. Options A, B, and D are not directly related to the end-product testing of intravenous solutions. Isotonicity, molarity checking by the laboratory, and pharmacist monitoring are important aspects of compounding and quality assurance but are not specifically part of the end-product testing process for intravenous solutions.