Which radioisotopes are used to measure RBC survival?

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Multiple Choice

Which radioisotopes are used to measure RBC survival?

Tracking how long circulating red blood cells stay in the bloodstream is done by labeling those cells with a radioactive tracer and then monitoring the label over time. Chromium-51 and indium-111 are used because they can be loaded into the red cells in a way that the radioactivity remains with the cells as they circulate, allowing accurate measurement of how many labeled cells are present at successive time points. By counting the radioactivity in blood samples (and sometimes with imaging), you get a survival curve that shows the lifespan of the red cells and helps detect abnormal hemolysis or sequestration. Other isotopes like phosphorus-32/33 label nucleic acids and don’t track RBC lifespan in the same way; iodine-125 labels proteins for other applications; technetium-99m is great for imaging but isn’t the standard choice for long-term RBC survival studies.

Tracking how long circulating red blood cells stay in the bloodstream is done by labeling those cells with a radioactive tracer and then monitoring the label over time. Chromium-51 and indium-111 are used because they can be loaded into the red cells in a way that the radioactivity remains with the cells as they circulate, allowing accurate measurement of how many labeled cells are present at successive time points. By counting the radioactivity in blood samples (and sometimes with imaging), you get a survival curve that shows the lifespan of the red cells and helps detect abnormal hemolysis or sequestration. Other isotopes like phosphorus-32/33 label nucleic acids and don’t track RBC lifespan in the same way; iodine-125 labels proteins for other applications; technetium-99m is great for imaging but isn’t the standard choice for long-term RBC survival studies.

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