We are equipped to provide full screening

Spinal tap

Punció lumbar a Vall d'Hebron

Spinal taps are used to extract samples from the cerebrospinal fluid, which is a substance that surrounds the brain and spinal column and protects them from possible injuries. This contact means that when there is a process that affects these body parts, the liquid is altered and we can detect it by analysing it.

Hospital o serveis complementaris relacionats

Multiple Sclerosis Centre of Catalonia

Where to find it

General Hospital

Where to find it


What is it for?

Using cerebrospinal fluid, we can measure pressure and take samples to perform different tests.

Thanks to these tests, several diseases can be diagnosed, such as neurological disorders and infections that affect the brain or bone marrow.


How does it work?

Spinal taps, or lumbar punctures, involve taking a sample of cerebrospinal fluid through the puncture with a needle in the lumbar area.

It is usually done with patients in the foetal position: lying on their sides with legs flexed so the knees touch the chest. Sometimes, the puncture is done with the person sitting and leaning forward.

Once the patient is in place, the area where the puncture is to be done is cleansed and disinfected. After administering anaesthesia, the puncture is performed between the two lumbar vertebrae with a spinal needle.

After this, we measure the pressure of the cerebrospinal fluid and take the sample, which will be from 1 to 10 ml.

The needle is then removed, the puncture zone cleaned and a bandage placed over the puncture area. Sometimes patients need to lie down for a while.



  • Discomfort during the examination
  • Headache that can last hours or days
  • Bleeding in the spinal canal or around the brain
  • Allergic reaction to anaesthesia
  • Infection from the needle
  • In people who have brain tumours, it can cause brain damage
  • If the person moves, the needle can cause damage to the nerves of the spinal cord



Spinal taps are the least aggressive way to get a sample of cerebrospinal fluid. Study of this liquid is essential to detect certain diseases that affect the brain and the spinal cord.




Healthcare specialisations
Related professionals
Dr. Xavier
Montalban Gairín
Head of Department
Clinical neuroimmunology
Dr. José
Álvarez Sabín
Head of Department
Sra. Pilar
Meler Amella
Sra. Nadia
Puertas Porrino
Dr. Oriol
de Fàbregues
Lead Researcher
Neurodegenerative Diseases
Sra. Cristina
Rivera Rubio
Physical Medicine and Rehabilitation
Dra. Marta
Dra. Maria
Peripheral Nervous System
Dra. Marta
Torres Ferrús
Headaches and Neurological Pain
Dra. Patricia
Pozo Rosich
Lead Researcher
Headaches and Neurological Pain
Sra. Elisenda
Conde Rodriguez
Peripheral Nervous System
News and events