The number of granulocytes rises from day 10 and normalizes at the end of
the first month. In most cases, the function of the granulocytes is normal and therefore, the number
of granulocytes can be translated as protection against bacterial infections. The presence
of more than 0.5 G/L neutrophils in the blood is considered as proof of engraftment. The number of
NK cells normalizes during the first month after transplant.
In general, the number of cells of the innate immune system correlates well with the function of
the respective lineage. This does not hold for the adaptative immune system where the cells express
different receptors and each individual T ot B cell may have another function. Here, the number of
cells may be normal but when essential T or B cells are missing, the adaptive immune system may
remain deficient.
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