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“The causes of non-reproducible results were: (1) insufficient reduction time for conversion of cystine to cysteine , and (2) the interference of creatinine.”
Clinica chimica acta; international journal of clinical chemistry • 1999 | View Paper
“At week 10, the increases in the serum levels of creatinine were less in the captopril (87 +/- 16 mmol/l) and cysteine (80 +/- 19 mmol/l) groups than in the control group (124 +/- 27 mmol/l) (P less than 0.01).”