Which of the following radiopharmaceuticals is used to label white blood cells with Tc-99m?

The radiopharmaceutical used to label white blood cells for imaging is Tc-99m-Exametazime. This compound is specifically designed for that purpose, allowing for the visualization of inflammatory processes and the detection of infection by tracking the activity of labeled white blood cells. Exametazime works by being taken up by the white blood cells as they migrate to sites of infection or inflammation, making it an effective tool in nuclear medicine.

The other options listed serve different purposes: Tc-99m-MIBI and Tc-99m-Sestamibi are primarily used for myocardial perfusion imaging and evaluating heart function, while Tc-99m-Pyrophosphate is utilized in bone imaging to detect conditions such as osteomyelitis or bone metastases. These different uses clarify why Exametazime is the appropriate choice for labeling white blood cells in diagnostic imaging.