Creatinine and cystatin C: Shooting at a flying target
2011
Discussion on Estimating Kidney Function in Critically Ill Patients
Commentary
Author Information
Author(s): Chao Chia-Ter
Primary Institution: National Taiwan University Hospital
Conclusion
The author suggests that both creatinine and cystatin C formulas are inadequate for estimating renal function in critically ill patients with acute kidney injury.
Supporting Evidence
- Creatinine-based formulas overestimate renal function in acute kidney injury.
- Cystatin C levels can be affected by muscle mass and inflammation.
- Cystatin C rises earlier than creatinine in acute kidney injury.
- Timing of blood tests significantly influences the results of kidney function estimates.
Takeaway
Doctors need to be careful when using blood tests to check kidney function in very sick patients because the tests can give wrong results if done at the wrong time.
Potential Biases
Potential bias due to the reliance on flawed equations for estimating kidney function.
Limitations
The commentary highlights that the original study did not consider the timing of tests and the duration of illnesses.
Digital Object Identifier (DOI)
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