Calcitriol increases renal tubular reabsorption of calcium which reduces the loss of calcium in the urine.

骨化三醇可以增加肾小管对钙的重吸收，减少尿钙。

Hypercalciuria can result from impaired renal tubular reabsorption of calcium, which leaves a lot of calcium behind in the tubule.

高尿钙可因肾小管重吸收钙功能不全导致，因此肾小管中残存了大量的钙。