Lumbar Puncture Procedure

Indications and Contraindications

The American Academy of Neurology indicates that lumbar puncture is contraindicated in patients with elevated intracranial pressure with evidence of space-occupying lesion 1, 2
The American College of Physicians suggests that coagulopathies that are not corrected are a contraindication for lumbar puncture 1, 3
Moderate to severe alteration of the state of consciousness is a relative contraindication for lumbar puncture, as indicated by the American Academy of Neurology 1
Patients who are anticoagulated require adequate reversal before undergoing a lumbar puncture, according to the American College of Chest Physicians 3

The patient should be positioned preferably in the lateral decubitus position (fetal position) during the lumbar puncture procedure, as recommended by the American Academy of Neurology 4
The use of atraumatic needles (smaller risk of post-puncture headache) is advised by the American Headache Society 4
The needle should be inserted with the bevel parallel to the dural fibers, as suggested by the American Academy of Neurology 4
The cerebrospinal fluid should be extracted by gravity (avoid active aspiration), according to the American Academy of Neurology 4
No more than 30 ml of cerebrospinal fluid should be extracted (safe volume), as recommended by the American Academy of Neurology 4
No more than 4 attempts at puncture should be made, according to the American Academy of Neurology 4

Prolonged rest is not necessary after the procedure, as indicated by the American Academy of Neurology 4
Immediate mobilization does not increase the risk of post-puncture headache, according to the American Headache Society 4

Clinical evaluation, not cranial CT, should be used to determine if it is safe to perform a lumbar puncture, as suggested by the Infectious Diseases Society of America 1, 3
If there are clinical contraindications that indicate possible elevated intracranial pressure, a CT scan should be performed before the puncture, according to the American College of Radiology 1, 3

Young age is a risk factor for post-puncture headache, as indicated by the American Headache Society 4, 5
Female sex is a risk factor for post-puncture headache, according to the American Headache Society 5
History of previous headache is a risk factor for post-puncture headache, as suggested by the American Headache Society 5
Body mass index ≤25 kg/m² is a risk factor for post-puncture headache, according to the American Headache Society 5
Fear of the procedure is a risk factor for post-puncture headache, as indicated by the American Headache Society 5
Use of cutting-edge needles is a risk factor for post-puncture headache, according to the American Academy of Neurology 4, 5
Multiple attempts at puncture are a risk factor for post-puncture headache, as suggested by the American Academy of Neurology 4

Post-puncture headache (more frequent in young patients) is a common complication, as indicated by the American Headache Society 4, 5
Low back pain is a common complication, according to the American Academy of Neurology 4
Transient nausea and dizziness are common complications, as suggested by the American Headache Society 5
The use of atraumatic needles of small caliber (≥24G) can help prevent complications, according to the American Academy of Neurology 4
Limiting the number of attempts to four or less can help prevent complications, as recommended by the American Academy of Neurology 4
Allowing the cerebrospinal fluid to exit by gravity instead of active aspiration can help prevent complications, according to the American Academy of Neurology 4

Immediate mobilization is safe and recommended, as lying down after LP provides no significant benefit in preventing post-LP headache compared to immediate mobilization (relative risk 0.98, 95% CI 0.68-1.41) 6
Low-impact cardiovascular exercise, such as walking, swimming, cycling, or elliptical training, can be performed immediately after the procedure if the patient feels well, without increasing complication risk 6

For moderate to high-impact exercise, clinical prudence suggests monitoring for symptoms during the first 24-48 hours, and temporarily reducing activity intensity if typical post-LP headache occurs 6

Severe headache that worsens progressively is a warning sign that should prompt medical evaluation 6
Fever or signs of infection are warning signs that should prompt medical evaluation, according to the Centers for Disease Control and Prevention 7

Younger patients have a 32% higher risk of post-LP headache than those over 65 years 6