haematology users' handbook - University College London Hospitals
haematology users' handbook - University College London Hospitals
haematology users' handbook - University College London Hospitals
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Test Specimen type Key Factors<br />
affecting tests<br />
Notes<br />
Reference<br />
Range<br />
Out of hours<br />
service<br />
Time Limit for<br />
requesting<br />
additional<br />
tests from<br />
time of<br />
venesection<br />
Turnaround<br />
time from<br />
receipt of<br />
sample (in<br />
working<br />
days for non<br />
urgent<br />
requests)<br />
Platelet Aggregation<br />
studies<br />
7 x 4.5ml Sodium<br />
Citrated samples<br />
Recommendation:<br />
also send an EDTA<br />
sample for a FBC)<br />
Aspirin affects<br />
platelet<br />
aggregation:<br />
testing is not<br />
recommended<br />
while patient is on<br />
aspirin.<br />
Delayed receipt<br />
of sample.<br />
Samples must be kept at<br />
room temperature and<br />
received by the lab within<br />
1.5 hours of phlebotomy<br />
and before 1200 hrs.<br />
Contact the<br />
laboratory<br />
No out of<br />
hours service<br />
Tests must be<br />
performed<br />
within 5<br />
hours of<br />
venepuncture.<br />
1 working<br />
day<br />
Samples not kept<br />
at room<br />
temperature.<br />
Significant<br />
thrombocytopaeni<br />
a: aggregation<br />
studies only<br />
possible with an<br />
adequate platelet<br />
count<br />
Haemostasis (page 4 of 6)<br />
HAEM-PD-UserHbook V8 Haematology and Blood Transfusion User Handbook Page 22 of 38<br />
Authors: Karen Orfinada (Senior Biomedical Scientist)<br />
Sally McDonald (Senior Biomedical Scientist) Authorised by: Dave Barnett Review Date: August 2015
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