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Fetal Albumin Concentration in Maternal Serum (24-Hour Average)

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

This test measures the average level of fetal albumin in your blood over the past 24 hours. Albumin is a protein produced by the fetus that can cross the placenta into your bloodstream.

Quick summary

["Helps assess fetal well-being and placental function by tracking protein exchange between mother and baby."]

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

Key facts at a glance

LOINC
33145-4
Short code
Fet Abd Circum from GA.ASUM00
Synonyms
Fet Abd Circum from GA.ASUM00
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
us-estimated-from-asum
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

Why This Test Is Done

Your healthcare provider may order this test if you’re at higher risk for complications like preterm labor, placental issues, or fetal growth problems. It can also be used to monitor certain pregnancies with known risks.

What to Expect Before the Test

No special preparation is needed. You’ll have a simple blood draw, similar to other routine tests. The sample is taken from a vein in your arm.

What the Results Mean

Results help determine if the placenta is functioning properly by measuring the steady flow of fetal albumin into your bloodstream. Abnormal levels may signal potential problems that need further evaluation.

Common Causes for Testing

This test is often performed in high-risk pregnancies, such as those with multiple fetuses, gestational diabetes, or a history of preterm birth. It may also be used to evaluate placental health in cases of suspected fetal distress.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Fetal Albumin Levels

Short name

Fetal Albumin (Serum, 24h)

Frequently asked questions

How often will I need this test?
The frequency depends on your pregnancy risks and healthcare provider’s recommendations. Some patients may need it weekly or biweekly during high-risk periods.
What if my results are outside the expected range?
If results are abnormal, your provider will discuss next steps, which may include additional tests, closer monitoring, or interventions to address potential issues.
Can I eat or drink before this test?
You can eat and drink normally before the test, as no fasting is required. However, always follow your provider’s specific instructions for your bloodwork.
  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