What quantitative test is performed when the rosette test for fetal maternal hemorrhage is positive?

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The rosette test is a qualitative test used to screen for the presence of fetal red blood cells in the maternal circulation. If the test is positive, a Kleihauer-Betke (KB) test is performed to quantitatively determine the volume of fetal cells in the maternal circulation. The KB test involves acid elution of fetal hemoglobin from maternal red blood cells, followed by staining with a special reagent, and counting of the fetal cells.

What Quantitative Test Is Performed When the Rosette Test for Fetal