负荷还原试验
Load reduction test
以上为机器翻译结果，长、整句建议使用 人工翻译 。
所有患者均经尿蝶呤谱分析、BH4口服负荷试验及红细胞二氢蝶呤还原酶测定，确诊为BH4缺乏症。
All cases were diagnosed as BH4 deficiency by analysis of urinary pterins profile, BH4 loading test, and determination of dihydropteridine reductase in RBC.
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