so whatever gets filtered ends up in the urine.

所以无论如何它会被过滤并留在尿液中
This molecule turns out to be a convenient tool

这个分子被证明
that physicians can use to measure your glomerular filtrate rate

是生理学家可用以测量肾小球过滤率的
in the event that they want to test your kidney function.

一个方便工具
How would you do that?

那该怎么实施呢
You would inject an amount of inulin into the blood

注射一定数量的菊糖进入血液
and you would measure how much--

并测量
what's the concentration of inulin in the plasma?

血浆中菊糖的浓度吗
You would inject some amount of inulin

注射一些菊糖
and you'd measure how much of it is in the plasma.

并测量血浆有多少菊糖
You'd then wait over some period of time

等待一段时间后
and you would collect the urine

收集尿液