Hi, my son aged 16 had a kidney removed last year due to a blockage. He has been monitored regular and his creatinine levels have been from 96-105 this month. Our doctor decided to test his Cystatin C level and it came back this week at 73ml. He has referred him back to GOSH. What does the outcome look like and can it get better?

The Cystatin C level is another way to estimate the glomerular filtration rate (eGFR).  An eGFR of 73 milliliters per minute per 1.73 meters squared would be normal for someone with a single kidney.  I am not sure I see a problem that is present.

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