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Coagulation factor VIII activity

Coagulation factors are proteins in your blood. They help form blood clots to stop bleeding when you have an injury. These proteins are also called clotting factors. You have several different types of clotting factors that are all important for making blood clots.

A coagulation factor test is used to find out if you have a problem with any of your clotting factors that may cause too little or too much blood clotting.

Source: MedlinePlus, U.S. National Library of Medicine

Normal range

10 published ranges, each from a named source
18 y+
56–191 %
Normal
50–200 % (varies by lab)ABIM 50–150 · Mayo 55–200 %

These labs do not agree: the published adult ranges differ by up to 33%, so the same result can read as normal at one lab and be flagged at another — ABIM 50–150 · Mayo 55–200 %. Both are real published values, shown as each lab states them.

Ranges from ARUP Laboratories Test Directory, American Board of Internal Medicine (Laboratory Test Reference Ranges), Mayo Clinic Laboratories (Pediatric Test Catalog).

All source ranges (10)
SourceSexAgeRange
American Board of Internal Medicine (Laboratory Test Reference Ranges) All all ages 50–150 %
ARUP Laboratories Test Directory All ≤ 6 y 56–191 %
ARUP Laboratories Test Directory All 7 y – 9 y 76–199 %
ARUP Laboratories Test Directory All 10 y – 11 y 80–209 %
ARUP Laboratories Test Directory All 12 y – 13 y 72–198 %
ARUP Laboratories Test Directory All 14 y – 15 y 69–237 %
ARUP Laboratories Test Directory All 16 y – 17 y 63–221 %
ARUP Laboratories Test Directory All 18 y+ 56–191 %
Mayo Clinic Laboratories (Pediatric Test Catalog) All all ages >40 %.
Mayo Clinic Laboratories (Pediatric Test Catalog) All all ages 55–200 %
details
Sample
Serum or plasma · LOINC
Code
LOINC 3209-4 · %
Also known as
AHG, AHF, Fact VIII, FVIII, Factor 8
See your own Coagulation factor VIII activity Add a lab report and it is drawn against your lab's range, over time. Upload a Blood Test