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Variable stability of 3 representative urine proteins. One-, 3-, and 7-day stabilities of (A) urinary albumin, (B) myoglobin, and (C) neutrophil gelatinase–associated lipocalin (NGAL) by storage condition. Dashed lines indicate ±10% change from the initial day 0 value. Data adapted from clinical validate studies in the Mayo Clinic Renal Testing Laboratory.
