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Fetal Lambda Light Chain Protein in Serum (Electrophoresis)

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

This test measures the amount of fetal-derived light chain proteins in your blood, often checked during pregnancy to assess fetal health or detect certain conditions.

Quick summary

["This test helps monitor fetal protein levels, which may indicate potential complications or genetic factors."]

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

Key facts at a glance

LOINC
33196-7
Short code
Fet LV PH width US.meas
Synonyms
Fet LV PH width US.meas
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-measured
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 Is This Test Done?

Your healthcare provider may order this test if you are pregnant and there are concerns about fetal development, such as suspected fetal abnormalities or genetic disorders. It can also be part of routine prenatal screening in specific cases.

What Does the Test Involve?

A blood sample is taken from a vein in your arm. The sample is then processed to separate and analyze the protein components, including fetal light chains, using electrophoresis—a technique that sorts proteins based on size and charge.

What Are Common Reasons for Testing?

This test is less common but may be used in specialized cases, such as evaluating fetal protein profiles in high-risk pregnancies or researching genetic conditions affecting protein synthesis.

What Are Potential Results?

Results are interpreted by comparing the measured fetal light chain levels to expected ranges for gestational age. Abnormal findings may prompt further diagnostic testing or monitoring.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: This test is primarily used in research or specialized clinical scenarios to study fetal protein metabolism. Elevated or unusual levels may suggest genetic disorders, fetal stress, or other metabolic conditions that require further evaluation by a specialist.

Short name

Fetal Lambda Light Chain

Frequently asked questions

What does an abnormal result mean?
An abnormal result may indicate an unusual protein profile that could be linked to genetic factors, fetal health concerns, or conditions affecting protein production. Your healthcare provider will discuss findings in detail with you.
How often is this test repeated?
This test is not routinely repeated unless part of ongoing research or a specific clinical protocol. If ordered for monitoring, your provider will determine the frequency based on your situation.
Can I prepare for this test?
No special preparation is needed. You may have a light snack before the blood draw, but avoid heavy meals. Follow any specific instructions your provider gives you.
  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