Table 1: Different reference values for copper and zinc in blood serum in the literature.

Cu (μmol/L)Zn (μmol/L)Reference

16–32[13]
12–20>7.7[14]
>12.6>12.6[15]
5.2–5.5[16]
16–3210.7–19.9[17]
12.5–32.812–46[18]
12–2412–24[19]
8–3910–20[20]
14–1914.5–20.0[21]