Glow stick or urine sample?

The random urine sample shown in Fig. 1 was collected from a 43-year-old woman with systemic lupus erythematosus. A routine urinalysis (Aution Max AX-4280; Iris Diagnostics) revealed no remarkable findings and, specifically, was negative for protein. The corresponding urine protein concentration, however, was 448 mg/dL (reference interval, 12 mg/dL) as measured with a turbidimetric assay (Cobas c701; Roche Diagnostics). Protein concentrations in urine samples previously collected from this patient were undetectable.