3 sentences

1. 他的肾功能没有改善。

   tā de shèn gōng​néng méi​yǒu gǎi​shàn.

   His kidney function hasn't improved.

   Source: OpenSubtitles

2. 肾功能正常。

   shèn gōng​néng zhèng​cháng.

   Kidney function's normal.

   Source: OpenSubtitles

3. 由于肾功能衰竭，他必须每周去医院做三次透析。

   yóu​yú shèn gōng​néng shuāi​jié, tā bì​xū měi zhōu qù yī​yuàn zuò sān cì tòu​xī.

   Due to kidney failure, he must go to the hospital for dialysis three times a week.

   Source: Dong Chinese Dictionary