Plasma and serum zinc concentrations: effect of time between collection and separation.
The effect of time between collection and separation of blood samples obtained from 9 subjects was examined with respect to plasma and serum zinc concentrations. There was a linear increase of 6% in zinc concentrations for the first 2 h that was similar for plasma and serum. Plasma zinc continued to increase linearly over the next 2 h, but increase in serum zinc concentrations was less for the second 2 h. It is concluded that differences between heparinized plasma and serum zinc concentration observed previously in this laboratory and elsewhere are attributable primarily to differences in time between collection and separation.
Department of Pediatrics, University of Colorado, Denver.
J L
JL
English
K M
KM
Hambidge
D000328:Adult; D002498:Centrifugation; D003018:Clot Retraction; D006493:Heparin; D006801:Humans; D010949:Plasma / Q000032:analysis; D013048:Specimen Handling; D013054:Spectrophotometry, Atomic; D013997:Time Factors; D015032:Zinc / Q000097:blood*
D006493:Heparin; D015032:Zinc