Objective:To investigate the effect of the blood sampling on the result of laboratory examination in the course of transfusion and to search for an appropriate time gap to obtain the unaffected examination result after transfusion.Methods:The subjects were divided into 4 groups

with 10 persons in each group.Blood samples were taken from all the subjects on empty stomach before transfusion

and then 500ml of 0.9%NaCl were administered intravenously on the forearm of the subjects.The 1st group

after 1h of transfusion

underwent the same side blood sampling in vein.The 2nd group

after 1h of transfusion

underwent

the other side blood sampling in vein.The 3rd group underwent the other side blood sampling in vein after transfusion.The 4th group underwent the other side blood sampling in vein

1h later after the finish of transfusion.RBC

WBC

HGB

PLT

K

+

Na

+

Cl

Ca

2+

GLU

BUN

Cr

TP

ALB

AST

ALT

TBIL

GGT

ALP were tested.Results:The same side blood sampling during transfusion showed the greatest effect on the result of examination

with remarkable difference（P

<

0.05）.The other side blood sampling during transfusion or after transfusion had the greatest effect on the result of many tests.Conclusion:Blood sampling during transfusion or after transfusion should be avoided.If for urgent need

blood sampling should be engaged in the other side of the infused limbs.