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| Biological variation and reference change vàlues of CA 19-9, CEA, AFP in sèrum of healthy individuals, Erden G, Barazi AO, Tezcan G and Yildirimkaya MM, 2008, Scand J Clin Lab Invest, 68, 212-8 | 27.2 | 64.24 | Mixed | Healthy (excl pregnant) | Serum |
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| . Biological variations of seven tumor markers, Qi Z, Zhang Lin, Chen Y, Ma X et al, 2015, Clin Chim Acta, 450, 233-6 | 6.76 | 48.56 | Mixed | Healthy (excl pregnant) | Serum |
