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Possible HLA relationships between a mother and her child
| Relationship | Mother | Child | Compatibility |
|---|---|---|---|
| 1 | A, B | A, C | Incompatible |
| 2A | A, A | A, A | Bidirectionally compatible (homozygous, identical) |
| 2B | A, A | A, B | Bidirectionally compatible (heterozygous, identical) |
| 3 | A, A | A, B | Mother compatible from son’s perspective only (mother homozygous) |
| 4 | A, B | A, A | Son compatible from mother’s perspective only (child homozygous) |
