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孟买血型学习笔记

  • 2026-04-21 08:43:50
孟买血型学习笔记

孟买血型是一种非常罕见的ABO血型系统变异,属于Hh血型系统。

一、 定义

孟买血型,也称为孟买表型或类孟买血型,其本质是红细胞表面完全缺乏H抗原。由于A抗原和B抗原的形成都必须以H抗原为基础,因此,即使个体携带正常的A或B基因,也无法在红细胞上形成A或B抗原,导致在常规血型检测中被误判为O型血。所以,它常被称为 “伪O型”。

二、 遗传机制

孟买血型的遗传基础是控制H抗原合成的FUT1基因(H基因)发生了纯合突变。个体的基因型为 hh,即两条染色体上的H基因均为失活型,导致无法合成H抗原。

没有H抗原作为“底座”,后续的A基因或B基因便无法发挥作用,因此无论其ABO基因型是AO、BO还是AB,其红细胞上均无A、B抗原,表型显示为O型。

三、 与正常O型血的根本区别

这是理解孟买血型的关键。虽然两者在常规检测中都显示为“O型”,但存在本质差异:

正常O型血:红细胞上有H抗原,血清中含有抗A、抗B抗体。

孟买血型:红细胞上完全无H抗原,也无A、B抗原。其血清中除含有抗A、抗B抗体外,还含有抗H抗体。

这个区别带来了巨大的临床风险:孟买血型者不能接受任何普通O型血的输血,因为普通O型血的红细胞上有H抗原,会与受血者血清中的抗H抗体发生严重的溶血反应。他们只能接受同为孟买血型者的血液。

四、 临床意义与挑战

1. 输血风险极高:孟买血型者如需输血,必须使用同为孟买血型的血液。因此,它被称为比“熊猫血”(Rh阴性)更为稀有的 “恐龙血”,在紧急情况下配血极其困难。

2. 血型鉴定易漏诊:普通医院的血型检测通常无法发现H抗原的缺失,极易将其报告为O型。确诊需要到血站或具备条件的实验室进行特殊的血清学检测。

3. 可能引发亲子关系误解:一位表现为O型血(实为孟买血型且携带A基因)的母亲,与一位B型血的父亲,可能生出A型血的孩子。这看似违背了常规ABO血型遗传规律,容易引发疑虑。此时需要通过DNA鉴定来科学确认血缘关系。

五、 流行病学

孟买血型在全球分布极不均衡,在印度孟买地区最早发现且相对最多,发生率大于1/10,000。在欧洲非常罕见,约1/1,000,000。在中国大陆缺乏全国性数据,在台湾、香港、福建等地区的发生率约为1/8,000 ~ 1/16,000。

总结

孟买血型是一种因缺乏H抗原而导致ABO抗原无法表达的特殊稀有血型。 其核心特点是:常规检测为O型,但血清中含有抗H抗体,导致输血时必须使用同型血。

它是解释“父母血型与子女血型不符”的经典遗传学案例之一,在临床输血和亲子鉴定中具有重要警示意义。

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  136. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-template/src/Template.php ( 46.61 KB )
  137. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  138. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/no.67808.cn/runtime/temp/6df755f970a38e704c5414acbc6e8bcd.php ( 12.06 KB )
  140. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000654s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000902s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000408s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000303s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000610s ]
  6. SELECT * FROM `set` [ RunTime:0.000261s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000592s ]
  8. SELECT * FROM `article` WHERE `id` = 482628 LIMIT 1 [ RunTime:0.000439s ]
  9. UPDATE `article` SET `lasttime` = 1776774599 WHERE `id` = 482628 [ RunTime:0.002559s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000606s ]
  11. SELECT * FROM `article` WHERE `id` < 482628 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000524s ]
  12. SELECT * FROM `article` WHERE `id` > 482628 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000424s ]
  13. SELECT * FROM `article` WHERE `id` < 482628 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002454s ]
  14. SELECT * FROM `article` WHERE `id` < 482628 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002391s ]
  15. SELECT * FROM `article` WHERE `id` < 482628 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003071s ]
0.086088s