Skip to content

Fetal Hemoglobin (HbF) Screening in Serum/Plasma

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

This test measures the level of fetal hemoglobin (HbF) in your blood. HbF is a type of hemoglobin found in fetal blood, which can sometimes be detected in adults.

Quick summary

["HbF levels may indicate conditions like fetal hemoglobin disorders or certain blood-related conditions in adults."]

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

Key facts at a glance

LOINC
11949-5
Short code
Fet ID criteria US
Synonyms
Fet ID criteria US
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
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 to check for fetal hemoglobin levels if you have symptoms related to blood disorders, anemia, or if you’re being evaluated for conditions like thalassemia or sickle cell trait. It may also be part of prenatal testing if you’re pregnant or planning to become pregnant.

What Does the Test Involve?

A blood sample is taken from a vein in your arm. The blood is processed to separate serum or plasma, which is then analyzed for fetal hemoglobin levels using a specialized laboratory method.

What Are the Possible Results?

Results are qualitative (present or absent) or may be reported as a ratio or index relative to other hemoglobin types. Your healthcare provider will interpret the results in the context of your medical history and symptoms.

What Does a High or Low HbF Level Mean?

Elevated fetal hemoglobin levels in adults may suggest certain genetic blood disorders, such as beta-thalassemia or sickle cell trait. Low or absent levels are typically not clinically significant in adults but may be relevant in specific medical contexts.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance: Fetal hemoglobin (HbF) is primarily associated with fetal development but can be detected in adults under certain conditions. High levels may indicate inherited blood disorders that affect red blood cell production or structure. This test helps identify potential genetic risks or conditions that may require further evaluation or management.

Short name

HbF Screening

Frequently asked questions

What does an abnormal HbF result mean?
An abnormal result may suggest an inherited blood disorder like thalassemia or sickle cell trait, which can affect how your body produces healthy red blood cells. Your doctor will discuss next steps, such as genetic counseling or further testing, based on your specific situation.
How often should I get this test?
This test is usually done once or as part of a specific evaluation, such as prenatal screening or diagnosing a suspected blood disorder. Your healthcare provider will determine the need for repeat testing based on your medical history and symptoms.
Is there any preparation needed before the test?
No special preparation is needed for this blood test. You may have some mild discomfort from the needle, but it typically resolves quickly. If you’re pregnant or have a history of bleeding disorders, let your healthcare provider know before the test.
  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