Department

Haematology

Preferred Sample Type

2.7ml

Specimen Transport

Standard transport to laboratory

Sample Processing in Laboratory

Sample should be centrifuged

Sample Preparation

Samples for any coagulation tests must be filled to within a tolerance of 10% of the fill line indicated on the sample tube. Any sample filled above or below this level will be reported as overfilled or insufficient and a repeat sample will be required

Turnaround Time

4 hours

Sample Stability

8 hours

Fibrinogen

Notes

For the effects of direct oral anticoagulants on coagulation tests click here

A Clauss fibrinogen is routinely assayed on all fibrinogen requests.

A derived fibrinogen is an indirect measurement of fibrinogen, and is calculated from the results obtained during the PT assay. However literature shows the assay produces highly variable results and yields higher values than the Clauss technique in samples from certain groups of patients. As fibrinogen levels are useful in interpreting abnormal PT or APTT’s, a derived fibrinogen is performed in the background on all samples requesting a PT and if a reduced result is suspected a Clauss fibrinogen is reflexed and reported.

Reference Range

1.5 - 4.1 g/L

Paediatric reference ranges can be found here

Specifications

EQA Scheme?: Yes
EQA Status: NEQAS