• British Pharmacopoeia Volume IV
  • Appendices
  • Appendix I A. General Reagents

Plasma Substrate R3
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Plasma Substrate R3 Prepare from human blood containing less than 1 per cent of the normal amount of factor XI. Collect the blood into one-ninth its volume of a 38 g/l solution of sodium citrate .

Store in small amounts in plastic tubes at a temperature of –30° or lower.