Pathology Handbook

Recent changes for Factor V
Date	Field	Changed From	Changed To
5th May 2026	Alternative names		Factor 5, F5L
	Request Group	F5	F5L
	Minimum/Paediatric Volume		1.0 mL
	Collection & Request Instructions	By consultation with Haematologist. Specimens cannot be analysed or re-analysed greater than 2 hours after collection.	By consultation with Haematologist. Specimens cannot be analysed or re-analysed greater than 2 hours after collection.
	Frequency		Weekly

Alternative Names:

Factor 5
F5L

Laboratory:

Haematology

Test Code:

F5L

Specimen Types:

Plasma

Container Types:

Sodium Citrate

Adults Volume or Mass:

2.7 mL

Minimum/Paediatric Volume or Mass:

1 mL

Collection & Request Instructions:

By consultation with Haematologist.

Specimens cannot be analysed or re-analysed greater than 2 hours after collection.

Transport Instructions between Sites and/or Laboratories:

Room Temperature

Assay Frequency:

Weekly

Additional Notes:

Reference Range: 50—150 % @ AAH and WH

Check to see if Factor 5 level or Factor 5 leiden - often confused and ordered incorrectly