Heparin tubes , logo : NH or LH , green
Heparln is a type of mucopolysaccharide with sulfate groups and strong nega-
tive charges.It facilitates antithrombin I to deactivate serine endopeptidase
and therefore , prevents the formation of thrombin . lt also prevents blood platelets

from aggregating.Heparin tubes are normaly used for biochemistry tests in
emergency setting and tests in blood flow. Heparin tubes are also the best choice
for electrolytes testing.