TY  - CHAP
M1  - Book, Section
TI  - Chapter 5. Laboratory Diagnosis: Clinical Hematology
A1  - Gomella, Leonard G.
A1  - Haist, Steven A.
PY  - 2007
T2  - Clinician's Pocket Reference: The Scut Monkey, 11e
AB  - Venipuncture  is  discussed  in  detail  in  Chapter  13,  Venipuncture.  The  best  CBC  sample  is  venous  blood  drawn  with  a  22-gauge  or  larger  needle.  For  a  routine  CBC,  venous  blood  must  be  placed  in  a  special  hematology  lab  tube,  usually  a  purple  top  tube,  containing  an  anticoagulant  (EDTA)  with  which  the  blood  must  be  mixed  gently.  Blood  for  a  CBC  should  be  fresh,  <  3  h  old.  Most  samples  for  coagulation  studies  are  submitted  in  a  blue  top  (citrate)  tube.  (See  Table  13–8  for  detailed  description  of  blood  collection  tubes.)  If  a  capillary  fingerstick  or  heelstick  (see  Heelstick  and  Fingerstick)  is  used,  the  hematocrit  may  be  falsely  low.  If  the  finger  has  to  be  “milked,”  sludging  of  the  RBCs  can  create  a  falsely  high  hematocrit.  Wright  staining  can  also  be  done  and  viewed  as  outlined  in  the  next  section.  
SN  - 
PB  - The McGraw-Hill Companies
CY  - New York, NY
Y2  - 2024/04/23
UR  - accessmedicine.mhmedical.com/content.aspx?aid=2700348
ER  -