Cerebrospinal fluid tap (CSF analysis) in pets - Meaning & procedure

A cerebrospinal fluid tap, also known as CSF analysis, is an important diagnostic test for neurological conditions. Cerebrospinal fluid (CSF) surrounds the brain and spinal cord and contains valuable information about inflammation, infections, and other conditions. In dogs and cats, this test can help establish a diagnosis when symptoms such as epileptic seizures, coordination disorders, or paralysis are present.

In this article, we discuss how a cerebrospinal fluid tap is performed, when it is used, and what the results mean.

What is a cerebrospinal fluid tap?

A cerebrospinal fluid tap is a procedure in which a thin needle is used to collect fluid from the space surrounding the brain/spinal cord. The fluid is then examined in the laboratory for cells, proteins, bacteria, or viruses. This test can provide indications of inflammation (immune-mediated or infectious), hemorrhage, or tumors.

When is a cerebrospinal fluid tap needed?

The test is often performed in dogs and cats with neurological complaints such as:

• Epilepsy
• Paralysis
• Coordination disorders
• Blindness
• Abnormal behavior/consciousness
• Balance problems

How is the procedure performed?

A cerebrospinal fluid tap is always performed under general anesthesia to keep the animal completely still and prevent pain. The tap can be performed at two locations: at the base of the skull (cisterna magna) or at the level of the lumbar vertebrae (lumbar puncture). The choice depends on the suspected location of the abnormality. After collection, the fluid is immediately examined microscopically by the neurologist and, if needed, sent on for further laboratory analysis.

What does CSF analysis show?

The cerebrospinal fluid can reveal abnormalities such as:

• An elevated number of inflammatory cells (in infections or immune diseases)
• Elevated protein concentration (in inflammation or tumors)
• The presence of bacteria, viruses, or parasites
• Antibody titers (immunoglobulins)

Risks of the procedure

A cerebrospinal fluid tap is generally safe, but it does carry certain risks. Complications can include: hemorrhage, leakage of cerebrospinal fluid, or temporary worsening of symptoms (even death in patients with increased intracranial pressure). For this reason, the procedure is usually only performed after imaging if there is a suspicion of an intracranial lesion, or if the neurologist can determine that the risk is very limited.

Recovery after a cerebrospinal fluid tap

After the tap, the animal wakes up calmly from anesthesia. Most dogs and cats recover quickly and can go home the same day. Some animals experience mild stiffness or tenderness at the puncture site, which usually resolves on its own.

Want to know more?

Read more about our services in neurology and internal medicine. Our specialized veterinarians at Nesto have extensive experience with CSF analysis and guide you and your pet through the entire diagnostic process.

Frequently asked questions (FAQ)

What is a cerebrospinal fluid tap?

A test in which cerebrospinal fluid is collected and analyzed for inflammation, infections, and other conditions.

Is a cerebrospinal fluid tap dangerous?

The procedure is generally safe, but it is not without risk in patients with suspected brain lesions.

When is CSF analysis performed?

When infections or immune-mediated conditions are suspected, or to better interpret/further differentiate lesions seen on an MRI scan.

Does my pet need anesthesia?

Yes, general anesthesia is necessary to keep the animal completely still and pain-free.

How quickly are the results known?

Initial findings are often available within a few hours; extensive analyses can take several days.