医生通过氢呼气试验来诊断乳糖吸收不良与乳糖不耐受。正常情况下，人体呼气中仅含微量氢气。若存在乳糖吸收不良，未被消化吸收的乳糖经肠道菌群发酵，可产生氢气，最终导致呼气中氢气浓度显著升高。

在过去两个月里，特朗普政府一直受到联邦法院命令的约束，禁止削减与性别认同及性别确认护理相关的资金，作为回应特朗普总统的行政命令。联邦政府的律师在法庭文件中多次声称，政府一直在遵守该命令。然而，华盛顿州总检察长主导的一项诉讼中提交的新举报者记录似乎与这 ...

SACRAMENTO, United States, May 3 (Xinhua) -- California lawmakers are racing to build its own National Institutes of Health (NIH) as the U.S. administration pushed deep federal funding cuts that ...

LOS ANGELES, May 8 (Xinhua) -- A new study by researchers at the U.S. National Institutes of Health (NIH) has revealed a concerning rise in the incidence of several cancer types among individuals ...