haematology users' handbook - University College London Hospitals

Haemostasis (page 6 of 6)
Test Specimen type Key Factors
affecting
tests
Notes
Referenc
e Range
Out of
hours
service
Time Limit
for
requesting
additional
tests from
time of
venesection
Turnaround
time from
receipt of
sample (in
working
days for
non urgent
requests)
Thrombophilia screen
Antithrombin,
Protein C,
Protein S,
Lupus Anticoagulant,
Cardiolipin Antibodies,
Factor V Leiden,
Prothrombin Gene
Mutation, MTHFR
mutation.
Also Factor VII and X
assays when patients
are on warfarin.
4 x 4.5ml
Sodium
Citrated
samples
+
1 x 5ml SST
sample
+
1 x 4.5ml
EDTA
Delayed
receipt of
sample.
Plasma must
be processed
within 5
hours of
venesection.
Warfarin and
Heparin
Acute illness
may affect
results of
some tests
These tests require authorisation
unless the patient is a Haematology,
NHNN or HASU patient: for all other
patients, please contact the
Haemostasis or Haematology SpR
(bleep 7044 or 7000) for authorisation
before taking samples.
These tests can be requested
individually.
Samples for Factor V Leiden, MTHFR
and Prothrombin Gene Mutation are
sent from Haemostasis, UCLH to TDL
Genetics
Contact
the
laboratory
Antithrombin,
Protein C
and Protein S
only, by
agreement
with the
Haematology
Consultant
on call and
subject to
staff
availability.
Contact the
Laboratory
3 working
days
Referral Laboratories:
Special Haematology (page 1 of 3)
For Nucleotides, PF1.2 and TAT (Thrombin
antithrombin complex)
Haemostasis Research Unit,
Department of Haematology
University College London Hospitals
1 st Floor, 51 Chenies Mews
London WC1E 6HX
For VWF Multimers
Haemophilia Centre and Thrombosis Unit,
Ground Floor
Royal Free Hospital
Pond Street
London NW3 2QG
For Factor V Leiden, Prothrombin Gene
Mutation and MTHFR Mutation
TDL Genetics
3 rd Floor
60 Whitfield Street
London W1T 4EU
2 nd Floor, 60 Whitfield St London W1T 4EU Hours: 09.00 -17.15 Monday – Friday 0203 447 8533 or x78533
HAEM-PD-UserHbook V8 Haematology and Blood Transfusion User Handbook Page 25 of 38
Authors: Karen Orfinada (Senior Biomedical Scientist)
Sally McDonald (Senior Biomedical Scientist) Authorised by: Dave Barnett Review Date: August 2015