Coagulation Screen (Diagnostic)

Blood Sciences Test

Specimen

Sodium citrate tube

Minimum sample volume

1.8 mL adult or 1.3 mL paediatric.

For Neonates we can prepare half volume paediatric tubes, which will require 0.65 mL blood (filled to the black line). Please contact the Coagulation Section on extension 2916 before 1600 weekdays if you require these tubes.

Special Instructions

The tube must be filled correctly (filled to line on tube). It must be received in the laboratory on the same day.

For specific coagulation factor assay requests, please contact the laboratory

Factors affecting results

Haemolysed or clotted samples cannot be tested. To avoid haemolysis and clotted samples mix tube gently by inversion, do not shake.

Patients on anticoagulants will have abnormal results.

Reference Ranges

(Adult)

PT: 11-14 sec
INR : 0.9 – 1.2 (ratio)
APTR : 0.87 – 1.13 (ratio)
From: Williams M, Chalmers E,Gibson B British Journal of Haematology 2002 119: 295 – 309,Andrew M et al Blood 1992 80: 1998 – 2005
Fibrinogen (Clauss) 2.0 – 4.0 g/L
From: Toulon P, Berruyer M, et al Coagulation & Fibrinolysis 2016 116 p 9-16
Ranges for other age groups available from laboratory and are automatically adjusted on the report

Availability

In house

STAT availability

Yes

Turnaround times

1 hr – STAT samples

4 hr – routine samples

Clinical Advice

Clinical advice is available from the Haematology Medical team (contact RD&E switchboard on 01392 411611)

Specimen Labelling Procedure