“…Normal serum zinc is considered to be in the range 10–18 μmol/L, with higher levels in men than in women 33 but variations in published figures may be due to the accuracy of analytical methods used and circadian rhythms of zinc levels 48 . A serum zinc level below 9 μmol/L is biochemically defined as zinc deficiency 49 but malignancies, hyperactivity, 50 stress, trauma, active tuberculosis, skin diseases, chronic wounds, 51–53 chronic renal insufficiency, uremia, 54 and nephrotic syndrome are predictable causes of hypozincemia. Lower than normal serum zinc in pregnant women is presumably a result of transplacental transfer of zinc from mother to fetus 55 …”