Mary Smith is pregnant and has anti-D in her serum. Her seru…

Mary Smith is pregnant and has anti-D in her serum. Her serum was titered in her 4th and 5th months of pregnancy, using the standard doubling dilution method (i.e. 1:1, 1:2, 1:4, etc). The results are shown below. Mary’s titer at 5 months is considered significant because: Patient: Mary Smith Tube number 1 2 3 4 5 6 7 8 9 10 4th month of pregnancy 4+ 4+ 3+ 2+ 2+ 1+ – – – – 5th month of pregnancy 4+ 4+ 4+ 3+ 3+ 3+ 1+ – – –  

A 45-year old man is O, Rh negative with anti-K.  Given the…

A 45-year old man is O, Rh negative with anti-K.  Given the following population statistics, how many O negative donor units should be typed in order to find 3 that are K negative?            POPULATIONPhenotype             FrequencyK+k-                        0.2%K+k+                       8.8%K-k+                         91%K-k-                         rare