| balanced franslocation | 平衡易位 | 16 |
| Barts hydrops fetalis Barts | 水肿胎, Barts胎尔水肿综合征 | 64 |
| basal cell nevus syndrome | 基底细胞痣 | 118 |
| Becker′s muscular dystrophy | 轻型假肥大型肌营养不良 | 71 |
| β-globin gene cluste | β珠蛋白因簇 | 60 |
| β-thalassemia | β地中海贫血 | 65 |
| Bloom′s syndrome Bloom′s | 综合征 | 19,119 |
| blunt terminus | 平整末端 | 157 |
| brachydactyly | 短指症 | 49,86 |
| break point cluster region | 断点簇区 | 122 |
| breakage | 断裂 | 14 |
| brnachitis,chronic | 慢性支气管炎 | 115 |
| bronchial asthma | 支气管哮喘 | 115 |
| Burkitt lymphoma | 非洲恶性淋巴瘤 | 122 |