Creatinine — lab reference
In the reference guideMuscle mass, age, diet, medications, and assay matter. Review with eGFR, not alone.
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What’s searchable?Muscle mass, age, diet, medications, and assay matter. Review with eGFR, not alone.
Calculated and context-dependent. Not a stand-alone diagnostic marker.
A1 <30; A2 30-300; A3 >300. Persistence ≥3 months matters for CKD classification.
Use laboratory and indication-specific thresholds; consider timed collection when needed.
Urine/plasma method, creatinine correction, collection timing, and assay matter.
Lab-specific. Interpret with symptoms, medication effects, and differential.
Altitude, smoking, hydration, androgen therapy, and pregnancy may shift values.
Consider altitude and iron/B12/folate status. Pregnancy requires trimester-specific ranges.
Hydration and altitude are major modifiers. Review alongside hemoglobin and RBC indices.
Macrocytosis and microcytosis require cause-specific interpretation.
Analyzer-specific. Review with MCV and MCHC.
Analyzer-specific; hemolysis and cold agglutinins may interfere.
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