This International Standard specifies requirements for single-use and re-usable glass and plastics tubes formeasuring the erythrocyte sedimentation rate (ESR) by the Westergren method, and for a support to holdtubes during the performance of the test. These so-called “Westergren tubes” are also sometimes designatedas “Westergren pipettes”. A procedure for measuring the erythrocyte sedimentation rate by the Westergrenmethod is given in informative Annex D.