Order of Blood Draw / Blood Transfer

The 4 Most Common Blood Collection Tubes

 

 

sodium citrate

(blue) 

 SST

(gold)

 PST
lithium heparin
(mint/light green)

EDTA

(lavender/purple) 

Order of Draw

Order of Draw is the order in which tubes are filled directly, using the evacuated tube blood collection method.


  • Blood tubes that are collected out of order may contain spill-over anticoagulants or additives and cause erroneous results.
  • Examples  a lavender tube drawn before a SST tube may give elevated potassium results.

 

Click here for a table showing the correct order of draw.

Order of Transfer

The same order is used when transferring blood from a syringe to the evacuated tubes as it is with Order of Draw.



 Do not push on the plunger of the syringe when tubes are filling.  The vacuum of the tubes will draw the sample from the syringe until the tube is filled.  The tube lid may pop off due to excess positive pressure in the tube, and/or hemolysis can occur.