Hemoglobin Electrophoresis for Fetal Red Blood Cells (Frbc) in Whole Blood
This test measures the types of hemoglobin in your red blood cells, including fetal hemoglobin (HbF), which is naturally present in adults but higher in newborns and some adults with certain conditions. It helps assess whether your blood contains unusually high levels of fetal hemoglobin, which may indicate genetic blood disorders.
["This test can help diagnose or monitor conditions like sickle cell disease or thalassemia by identifying abnormal hemoglobin patterns."]
Key facts at a glance
- LOINC
- 4574-0
- Short code
- Hgb E MFr Bld Elph Alk
- Synonyms
- Hgb E MFr Bld Elph Alk
- Category
- hematology
- Sample
- whole-blood
- Container
- Lavender-top (EDTA)
- Units
- N/A
- Ref low
- 3.5
- Ref high
- 5
- Critical range
- 7 N/A – 20 N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- electrophoresis-ph
- CPT
- 84132
- SNOMED
- 110742001
- Specimen volume
- 3 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h
- Hemolysis max
- 0
- Lipemia max
- 0
- Icterus max
- 0
- TAT
- 4–24 hours
- Order
- routine
Why This Test Is Done
Your healthcare provider may order this test if you have symptoms like fatigue, pale skin, or unusual blood test results that suggest abnormal hemoglobin. It’s also used in newborn screening or when evaluating family members of people with hemoglobin disorders.
What to Expect Before the Test
No special preparation is needed. A simple blood draw from a vein in your arm is all that’s required. The process takes a few minutes, and you may feel slight discomfort, but it’s usually over quickly.
What the Test Results Mean
Results show the proportion of different hemoglobin types, including fetal hemoglobin. High levels of fetal hemoglobin alone may not indicate a problem unless combined with other symptoms or genetic testing. Your provider will interpret results in the context of your medical history and other tests.
Common Conditions Linked to Abnormal Results
Elevated fetal hemoglobin can be seen in conditions like sickle cell trait, beta-thalassemia, or other hemoglobinopathies. Low or absent fetal hemoglobin in adults is rare but may occur in certain genetic disorders. Always discuss results with your healthcare provider for personalized guidance.
Reference range
Adult: 3.5-5.0 mmol/LN/A
No special preparation usually required. Stay well hydrated. Inform your healthcare provider of all medications and supplements you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
◆Associated findings1
Short name
Fetal Hemoglobin Electrophoresis
Frequently asked questions
How often will I need this test?
What are the typical reference ranges for this test?
Can I eat or drink anything before 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