Magno Kidney & Electrolytes
Cystatin C on TRT
What the number means, why it moves on a protocol, and what people usually do about it.
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 the honest kidney test for lifters.
The range
TRT-aware target
Read against the lab range and the trend
How to read the lab range
Under 1.0 mg/L is normal; 1.0 to 1.2 is worth a repeat; above that is a real reduction in filtration.
Why it moves on a protocol
- Actual kidney function.
- Thyroid disease and steroids (corticosteroids) shift it a little.
What people usually do · not a recommendation
- Ask for it whenever creatinine reads high on a protocol.
How Magno reads it
Import the PDF or a photo of the report and Magno finds Cystatin C on it, keeps every test on one line, shows the change since the last one, and reads it against TRT-aware thresholds rather than the lab's generic range. The panel it belongs to, Kidney & Electrolytes, gets a written verdict with the probable causes and what people usually do.
Read yours
Drop your lab PDF or a photo and get every marker read like this, in plain words. Free, no account, nothing leaves your browser. Save it in the app to see the change since your last test.
Questions people ask
Creatinine high, cystatin C normal, which is right?
Cystatin C. The creatinine is muscle and creatine, not the kidney.
Related markers
Not medical advice
This is how experienced TRT users read the number and what they usually do about it. Every decision about your protocol belongs to you and a clinician who knows you.