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Lumbar Puncture (Spinal Fluid Analysis) – Guided Needle Procedure

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

This test involves a guided needle procedure to collect a small sample of cerebrospinal fluid (CSF) from your spine. It helps diagnose conditions affecting your brain, spinal cord, or nerves.

Quick summary

["A lumbar puncture may be needed to check for infections, inflammation, or other spinal issues."]

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

Key facts at a glance

LOINC
87088-1
Short code
Guided L-spine Puncture
Synonyms
Guided L-spine Puncture
Category
chemistry
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
imaging-modality
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 have symptoms like severe headaches, neck stiffness, fever, or neurological problems. It can also be used to monitor conditions like multiple sclerosis, meningitis, or certain cancers.

What to Expect Before the Procedure

You’ll likely be asked to lie on your side with your knees bent (fetal position). A nurse or doctor will clean the area near your lower back and apply a numbing medicine. The procedure takes about 15–30 minutes.

During the Procedure

A needle will be guided into the spinal canal to collect a small amount of CSF. You may feel pressure or a slight pinch, but you should not feel pain. The sample is then sent to a lab for analysis.

After the Procedure

You’ll rest for a short time (often 1–2 hours) to avoid complications like a headache. Stay hydrated and avoid straining. Report any severe pain, fever, or signs of infection immediately.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Lumbar Puncture (CSF Analysis)

Frequently asked questions

What does a lumbar puncture involve?
It’s a simple but precise procedure where a needle collects spinal fluid under guidance (often ultrasound or fluoroscopy) to ensure accuracy. The fluid is then tested for cells, proteins, or pathogens.
Is the procedure painful?
Most people feel mild pressure or discomfort, but numbing medicine reduces pain. Some may experience a headache afterward, which can be managed with fluids or medication.
How long does it take to get results?
Lab results typically arrive within 24–48 hours, depending on the tests performed on the CSF sample.
  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