Cerebrospinal fluid hairpin hair count (mass concentration)
This test measures the number of hairpin-shaped hair cells (also called *hairpin cells* or *tanycytes*) in cerebrospinal fluid (CSF). These cells line the ventricles of the brain and play a role in fluid circulation and brain signaling.
["Hairpin hair cells in CSF may help assess brain function or detect abnormalities in fluid flow."]
Key facts at a glance
- LOINC
- 5620-0
- Short code
- Cr Hair-mCnt
- Synonyms
- Cr Hair-mCnt
- Category
- chemistry
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- 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
What Is Hairpin Hair Cell Count Used For?
Hairpin hair cells are part of the brain’s support system, helping maintain cerebrospinal fluid balance. While not a routine test, elevated counts may suggest conditions like hydrocephalus (excess fluid in the brain) or certain neurological disorders. Your doctor may order this test if symptoms like headaches, vision changes, or neurological issues are present.
How Is This Test Performed?
A small sample of cerebrospinal fluid is collected through a spinal tap (lumbar puncture) under sterile conditions. The sample is then analyzed in a lab to count hairpin-shaped cells under a microscope. Results are reported as a concentration value.
Sample Collection and Preparation
You’ll likely receive instructions to fast or avoid certain activities before the procedure. The spinal tap is usually done in a hospital setting with sedation to minimize discomfort. The fluid is sent to the lab immediately for analysis.
What Does the Test Result Mean?
Interpretation depends on clinical context. Normal results indicate no significant abnormalities in hairpin hair cell count. Abnormal results may prompt further evaluation, such as imaging or additional tests, to explore underlying causes.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Hairpin hair cells are rare in healthy CSF, so their presence or count is typically evaluated in cases of suspected hydrocephalus, brain tumors, or other conditions affecting CSF dynamics. Doctors may use this test to monitor fluid flow or diagnose rare neurological disorders.
Short name
CSF Hairpin Hair Cell Count
Frequently asked questions
Why might my doctor request this test?
How long does it take to get results?
Can I eat or drink before the 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