The antigram below explains possible reasons for cell #2 reacting stronger:
- The patient may have anti-D and another antibody whose corresponding antigen is on cell # 2, e.g., anti-E or anti-K (highlighted in orange).
- The patient has an antibody other than anti-D (e.g., anti-Jka) and cell #2 has a double dose of the antigen but cell #1 has only single dose (highlighted in teal).
Cell | Rh-Hr | Kell | Duffy | Kidd | Lewis | Lutheran | P | MNSs | Xg |
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| Rh | D | C | c | E | e | Cw | K | k | Kpa | Jsa | Fya | Fyb | Jka | Jkb | Lea | Leb | Lua | Lub | P | M | N | S | s | Xga | IS | 37° | AHG | CC |
1 | R1R1 | + | + | 0 | 0 | + | 0 | 0 | + | 0 | 0 | + | + | + | + | + | 0 | 0 | + | + | 0 | + | 0 | + | 0 | 0 | 0 | 1+ | NT |
2 | R2R2 | + | 0 | + | + | 0 | 0 | + | + | 0 | 0 | 0 | + | + | 0 | 0 | + | 0 | + | + | + | + | + | + | + | 0 | 0 | 2+ | NT |
3 | rr | 0 | 0 | + | 0 | + | 0 | 0 | + | 0 | 0 | + | 0 | 0 | + | 0 | + | 0 | + | 0 | + | 0 | + | 0 | 0 | 0 | 0 | 0 | √ |
Auto |
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| | | | | | | | | | | | | | | | | | | | | | | 0 | 0 | 0 | √ |