Fibrinogen (deprecated test, likely related to fibrinogen/fibrin degradation products or fibrinogen activity measurement)
This test was previously used to measure fibrinogen, a protein involved in blood clotting. Due to its obsolescence, it is no longer routinely ordered.
["Fibrinogen was historically checked for bleeding or clotting disorders but is now rarely requested."]
Key facts at a glance
- LOINC
- 42173-5
- Short code
- Deprecated Tib+Fib-R XR port
- Synonyms
- Deprecated Tib+Fib-R XR port
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- xr
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What This Test Was Originally Meant To Do
Fibrinogen was once measured to assess blood clotting function. It helps identify conditions like bleeding disorders (e.g., hemophilia) or clotting disorders (e.g., deep vein thrombosis). The protein helps blood form clots by converting into fibrin during injury.
Why This Test Is No Longer Used
Modern medicine relies on more specific tests like prothrombin time (PT) or activated partial thromboplastin time (aPTT) to evaluate clotting. Fibrinogen levels alone are less informative without additional context.
What Happens If This Test Is Ordered?
If your healthcare provider orders this test, it may be for research, historical records, or a specialized clinical scenario. Results are rarely actionable and are typically reviewed in the context of other tests.
Clinical Significance
While fibrinogen was once critical for diagnosing bleeding or clotting issues, its role is now secondary. Abnormal levels may still be checked in rare cases, but they are often paired with other tests for better accuracy.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Frequently asked questions
Why was this test marked as deprecated?
Could this test still be used for anything?
What should I expect if my doctor orders this test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy