Magno
Kidney & Electrolytes
Cystatin C on TRT
What the number means, why it moves on a protocol, and how it sits with related markers.
What it is
Cystatin C is a protein every cell makes at a steady rate, cleared by the kidneys. Unlike creatinine it does not care about muscle or creatine, so it is a cleaner kidney test for lifters.
The range
How to read the lab range
Under 1.0 mg/L is normal; above about 1.2 is a real reduction in filtration.
Why it moves on a protocol
- Actual kidney function.
- Thyroid disease and corticosteroids shift it a little.
How Magno reads it
Magno keeps every test on one line, against your lab's range, with the change since last time. Pro explains it in plain words. Get Magno for iPhone.
Read yours
Drop your lab PDF or a photo and get every marker explained in plain words. Free, no account, your file never leaves your browser. Track it in the iPhone app to see the change since your last test.
Questions people ask
Creatinine high, cystatin C normal, which is right?
Cystatin C is less affected by muscle and creatine, so the two together often point at muscle rather than the kidney.
Related markers
Not medical advice
This explains what the number is and why it moves. It is not medical advice; decisions belong to you and your clinician.