But blood tests are unlikely to reveal developing kidney problems in their early stages. Abnormalities do not generally show up in blood tests until the kidneys are severely damaged, with as little as only a quarter of kidney function remaining.
其中血液篩檢也很難在早期發現腎臟病變，往往要腎臟損傷到相當程度，甚至只剩下四分之一功能時，才能由血液中檢驗出來。