Venous Blood Collection Tube BD Vacutainer Serum Tube 10 mL 16 X 100 mm Red Top - Box of 100

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For 10.0 mL of whole serum, you can expect approx. 50% of the total serum to be plasma. This can vary from patient to patient, depending on a host of factors, but that is beyond the scope of the question. Please note, the Vacutainer® Red-Tops, as seen here are for collecting whole serum for those tests/uses that require whole serum with no additive. The lack of any additive however means you will not see a discrete yellow layer of plasma--rather the blood will eventually clot, with residual liquid coming to a rest on the top. While this is largely plasma and some proteinaceous components, it also contains a sufficient number of erythrocytes and free heme-complexes to bear a deep red pigment. Essentially a dark crimson clotted mass on the lower layer, and a largely clear, red colored liquid on the upper layer. Using a 10.0mL Vacutainer® Red-Top (careful, these tubes are specified in terms of 'draw,' that is to say the vacuum is sufficient to properly bring in blood to within approx. 10mL, the total volume of the tube is more...). Hope this is helpful.