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We routinely use Sarstedt tubes in Liverpool for zinc analysis and haven't encountered any problems with sample contamination. According to the textbooks, zinc concentration is higher in serum than in plasma due to release from platelets during the clotting process. However, when we compared zinc concentrations in 120 paired serum and plasma samples, the results were not significantly different (paired t-test): Serum Mean 10.0 umol/L, sd 1.4 umol/L Plasma Mean 10.2 umol/L, sd 1.4 umol/L Regards Catherine Wardle %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%