Table 1.

Reference ranges for the trace elements selenium (Se), iron (Fe), copper (Cu), and zinc (Zn).

Trace element	Reference ranges in serum	Reference
Se	70-150 μg/l	[11]
Fe	men: 0.55–1.60 mg/l women: 0.40–1.55 mg/l	[12]
Cu	0.64–1.40 mg/l	[12]
Zn	0.66–1.10 mg/l	[13]