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Fetal Fibrinogen Concentration (Serum or Plasma)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of fibrinogen, a protein involved in blood clotting, found in the blood of a fetus. It may be checked during pregnancy to assess certain risks or conditions.

Quick summary

["Fibrinogen levels in fetal blood can help monitor pregnancy health and identify potential risks."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
55192-9
Short code
Chrom analy interphase Amn FISH-Imp
Synonyms
Chrom analy interphase Amn FISH-Imp
Category
chemistry
Sample
fluid
Container
Sterile tube
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
fish
CPT
86038
Specimen volume
2-5 mL
Stability
Room temperature: 2h, Refrigerated: 24h
Hemolysis max
300
TAT
4–24 hours
Order
routine

Why Is This Test Done?

Your healthcare provider may order this test if you have concerns about complications during pregnancy, such as bleeding disorders, preterm labor, or fetal growth issues. It might also be part of a routine check if you have a history of pregnancy-related problems or certain medical conditions. Sometimes, it’s used to evaluate the risk of bleeding in the newborn after delivery.

What Does the Test Involve?

A blood sample is taken from your arm, usually during a routine prenatal visit. The sample is sent to a lab where it is analyzed to measure fibrinogen levels. The test does not require fasting and is generally quick and painless.

What Are the Results Measured Against?

Fetal fibrinogen levels are compared to standard reference ranges for healthy fetal blood. These ranges can vary slightly by lab and may be adjusted based on specific clinical circumstances.

What Do Low or High Levels Mean?

Low levels of fetal fibrinogen might suggest an increased risk of bleeding complications during delivery or in the newborn. High levels could be associated with other conditions that need further evaluation by your healthcare provider.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fibrinogen in fetal serum/plasma

Frequently asked questions

How is this test different from a standard fibrinogen test?
This test specifically measures fibrinogen in fetal blood, rather than maternal blood. Standard fibrinogen tests are typically done on maternal serum or plasma and are not the same as this fetal-specific test.
What kind of specimen is used for this test?
This test uses a sample of fetal serum or plasma, which is obtained through procedures like cord blood sampling or amniocentesis. The specimen is collected during pregnancy and analyzed in a laboratory.
Can I fast before this test?
No fasting is required for this test. Blood is drawn as part of your prenatal care, and the test focuses on measuring fibrinogen levels in the fetal sample.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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