Citrate Adjustment for Hematocrit

1
Citrate Adjustment for Hematocrit

• If patient hematocrit is greater than 55, adjust
  citrate concentration in blue top collection
  tubes using the following formula
• X (100-Hct)/(595-Hct)
• then take value for X and
• (X)(volume of tube) ml anticoagulant
• Example
• Hct 65 Blue tube volume 2.7ml
• X (100-65)/(595-65) 35/530 0.066
• 0.066 x 2.7ml 0.178ml Na citrate in place of
  usual volume of 0.27ml
• See Appendix, NCCLS document H21-A4 (2003) for
  convenient to use table

Lab Pointer
Revised mmiiii
M Ledford-Kraemer
www.CLOT-ED.com