What formula is used to calculate the percentage of remaining recipient cells after a transplant?

The formula for calculating the percentage of remaining recipient cells after a transplant is expressed as % of recipient cells = R/(R+D), where R represents the number of recipient cells and D represents the number of donor cells. This formula allows one to determine the proportion of recipient cells that are still present in relation to the total number of cells (recipient plus donor) following a transplant.

The reason this formula is correct is that it calculates the ratio of recipient cells to the total cell population, thereby effectively giving a clear picture of the cellular composition post-transplant. The numerator (R) indicates how many cells are of the recipient origin, while the denominator (R+D) accounts for all the cells present, providing a relative measure.

The other options misrepresent the relationships between the donor and recipient cells or the correct way to express the ratios. For example, the option that claims % of donor cells = R/(R+D) incorrectly uses the recipient cell count in the context of donor cells, which does not accurately reflect the relationship being examined. Thus, the correct option focuses specifically on the recipient cells and their proportion in the total cellular makeup after the transplant.