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Spurious azotemia associated with 5-fluorocytosine therapy
S M Colagiovanni1, E M Meares, G R Sant
1Department of Urology, New England Medical Center, Boston, Massachusetts.
False elevations in serum creatinine can occur with 5-fluorocytosine (5-FC) therapy. This drug interferes with common lab tests, potentially leading to misdiagnosis of kidney problems.
Area of Science:
- Clinical Chemistry
- Pharmacology
- Nephrology
Background:
- Serum creatinine is a key indicator of kidney function.
- 5-fluorocytosine (5-FC) is an antifungal medication used to treat serious infections.
- Accurate creatinine measurement is crucial for patient management.
Observation:
- A case report details a patient experiencing falsely elevated serum creatinine levels.
- The elevation was directly linked to the administration of 5-fluorocytosine (5-FC).
Findings:
- 5-fluorocytosine (5-FC) interferes with the enzymatic creatinine determination method.
- This interference specifically affects the Kodak Ektachem analyzer, causing spurious azotemia.
- The observed effect can mimic actual kidney dysfunction.
Implications:
- Clinicians must be aware of this drug interference when interpreting creatinine results.
- Misinterpretation could lead to unnecessary interventions or delayed appropriate treatment.
- Awareness aids in correct diagnosis and management of patients on 5-FC therapy for fungal infections.
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