血β2-微球蛋白（β2-MG）测定
参考答案：
1.参考值正常人血中β2-MG为0.8～2.4mg/L，平均约1.5mg/L。
2.临床意义①血β2-MG测定是反映肾小球滤过功能减退的一项敏感指标，当肾小球滤过功能下降时，血β2-MG水平即升高，且与年龄、性别、肌肉组织的多少等均无关。②当体内有炎症或肿瘤时，血β2-MG水平增高。③另外，当肾小管受损时，对β2-MG的重吸收减少，尿液中的β2-MG排出量增加。
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| It is well known that the English go out with an umbrella or a raincoat. Why? 1 the weather in Britain often changes quickly. It is not very usual for the same kind of weather to 2 long. Spring can be rainy or windy, 3 the weather is getting warmer and you can hope more sunny days. In fact, there 4 as much sunshine in spring as in summer. Summer is 5 time for visitors to go to the seaside and other places of interest. The weather can be sunny and nice. People often go out to have a walk or swim. Fall is a beautiful season 6 trees in the woods and parks changing color. During fall it is still nice to be outside, too. In winter, it gets colder. It might snow, especially on high land and in the north. There are 7 very high winds in this season. January and February are the coldest 8 of the year, while the warmest 9 often July and August. The difference 10 temperature between winter and summer is not so great, winter is about 45℃, and for summer about 15.5 ℃. | ||||
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