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Hemoglobin Variants in Cerebrospinal Fluid by Electrophoresis

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

This test measures different forms of hemoglobin (the protein in red blood cells that carries oxygen) found in your cerebrospinal fluid (the fluid surrounding your brain and spinal cord). It helps identify unusual hemoglobin patterns that may suggest conditions like bleeding into the brain or certain genetic disorders.

Quick summary

["Assesses abnormal hemoglobin in brain fluid for possible bleeding or genetic conditions."]

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

Key facts at a glance

LOINC
42505-8
Short code
HBV surface Ag CSF Ql
Synonyms
HBV surface Ag CSF Ql
Category
chemistry
Sample
csf
Container
Sterile tube
Units
N/A
Ref low
0
Ref high
5
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
CPT
82378
SNOMED
394995008
Specimen volume
1-2 mL
Stability
Immediate analysis required, Refrigerated: 1h
Hemolysis max
200
TAT
4–24 hours
Order
routine

Why This Test Might Be Ordered

Your doctor may recommend this test if they suspect bleeding inside your brain (such as a hemorrhage), exposure to certain toxins, or inherited blood disorders that affect hemoglobin structure. It can also be part of evaluating symptoms like severe headaches, neurological issues, or unexplained fatigue.

What to Expect Before the Test

No special preparation is needed. You’ll have a small sample of cerebrospinal fluid drawn through a needle inserted into your spine (lumbar puncture). This procedure is usually done in a hospital setting and may cause temporary soreness or mild discomfort.

What the Results Mean

Abnormal hemoglobin patterns (such as free hemoglobin or unusual variants) in CSF can indicate bleeding, metabolic issues, or genetic conditions. Normal results suggest no significant abnormalities in this specific protein profile.

Common Conditions Linked to This Test

This test is particularly useful for diagnosing bleeding in the brain (e.g., subarachnoid hemorrhage), certain genetic hemoglobinopathies, or conditions like hemolytic anemia where red blood cells break down prematurely.

Reference range

Non-smokers: <2.5 ng/mL; Smokers: <5.0 ng/mLN/A

Specimen: csf

No special preparation required. For PSA, avoid sexual activity for 24-48 hours before the test.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

CSF Hemoglobin Electrophoresis

Frequently asked questions

What causes abnormal hemoglobin in CSF?
Abnormal hemoglobin in CSF is most commonly linked to bleeding into the brain (e.g., from trauma, high blood pressure, or aneurysm rupture). It can also occur with certain toxins, severe infections, or rare genetic disorders affecting hemoglobin structure.
How long does it take to get results?
Results are typically available within 24–48 hours, depending on lab processing and any follow-up tests. Your doctor will discuss findings during your follow-up visit.
Can I drink alcohol before this test?
No, avoid alcohol for 24 hours before the test, as it may affect CSF composition and test accuracy. Follow your doctor’s specific instructions for any other restrictions.
  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