Fibrinogen Test
A blood test that measures fibrinogen, a protein needed for blood clotting.
Quick Summary
To investigate bleeding problems and serious illness affecting clotting.
Fibrinogen level.
No preparation.
Overview
Low fibrinogen can cause bleeding.
It rises with inflammation.
What It Measures
Fibrinogen
Clotting protein.
How It's Performed
- 01
Preparation
Usually no special preparation unless your doctor advises.
- 02
Blood sample
A small amount of blood is taken from a vein in your arm.
- 03
Afterwards
Press on the spot; a small bruise is common.
Reference Ranges
Note: Normal ranges vary by laboratory. Consult your report for the specific reference used.
| Parameter | Typical Range (Adult) | Units |
|---|---|---|
| Fibrinogen | 200–400 | mg/dL |
Interpreting Results & Next Steps
Discuss with Doctor
Normal ranges differ between laboratories; use the range on your report. Your doctor will explain what your result means and what happens next.
If values are Low:
Low levels increase bleeding risk.
If values are High:
High levels occur with inflammation.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Coagulation Factor Tests(opens in a new tab) · MedlinePlus, US National Library of Medicine