Hydroxyethyl starch
（重定向自Voluven）
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Hydroxyethyl starch (HES/HAES) is a nonionic starch derivative. It is one of the most frequently used volume expanders under the trade names Hespan by B. Braun Medical Inc. Voluven or Volulyte by Fresenius Kabi and Tetrahes or Hestar by Claris Lifesciences Ltd. HES is a general term and can be sub-classified according to average molecular weight, molar substitution, concentration, C2/C6 ratio and Maximum Daily Dose.