What is opening pressure CSF

Cerebrospinal fluid (CSF) opening pressure is a measurement of the pressure found inside the spinal canal when a care practitioner initially penetrates it to collect a sample of fluid for analysis. Doctors routinely note the CSF opening pressure because it can provide important information about a patient’s health.

What is a low CSF opening pressure?

By very definition, the opening CSF pressure is low, below 60 mm H(2)O, and often a “dry” tap is encountered. However, the pressure may be normal, especially with intermittent leaks and may vary tap to tap. Fluid analysis is normal.

How do you measure opening pressure?

For measurement of the opening pressure, the patient must be in the lateral recumbent position. After fluid is returned from the needle, attach the manometer through the stopcock, and note the height of the fluid column.

What is CSF opening and closing pressure?

o Initial opening pressure is 44.o Closing pressure is 21. o CSF is negative for blood.

What is normal CSF pressure in adults?

Normal CSF contains 0-5 mononuclear cells. The CSF pressure, measured at lumbar puncture (LP), is 100-180 mm of H2O (8-15 mm Hg) with the patient lying on the side and 200-300 mm with the patient sitting up.

How is CSF opening pressure measured?

Once CSF is obtained, connect the manometer and measure Opening Pressure (unless the Lumbar Puncture is performed in a seated position). It will take approximately one minute for CSF pressure to be measured and it is normal to observe the meniscus of CSF at the top of the manometer oscillate with respiration.

What are normal CSF values?

• Pressure: 70 to 180 mm H2O.
• Appearance: clear, colorless.
• CSF total protein: 15 to 60 mg/100 mL.
• Gamma globulin: 3% to 12% of the total protein.
• CSF glucose: 50 to 80 mg/100 mL (or greater than two thirds of blood sugar level)

What level should a lumbar puncture be?

Therefore a lumbar puncture is generally performed at or below the L3-L4 interspace. As a general anatomical rule, the line drawn between the posterior iliac crests often corresponds closely to the level of L3-L4. The interspace is selected after palpation of the spinous processes at each lumbar level.

How do you calculate CSF opening pressure?

CSF flow through a spinal needle is described by the equation: Flow = pressure/(needle constant x relative viscosity). Thus, CSF flow rate during lumbar puncture can be used to estimate CSF pressure.

What is high CSF pressure?

Intracranial hypertension means that the pressure of the fluid that surrounds the brain (cerebrospinal fluid or CSF) is too high. Elevated CSF pressure can cause two problems, severe headache and visual loss. If the elevated CSF pressure remains untreated, permanent visual loss or blindness may result.

Article first time published on

What is abnormal CSF?

Your CSF analysis results may indicate that you have an infection, an autoimmune disorder, such as multiple sclerosis, or another disease of the brain or spinal cord. Your provider will likely order more tests to confirm your diagnosis.

How do you read CSF results?

1. Appearance: Clear.
2. Opening pressure: 10-20 cmCSF.
3. WBC count: 0-5 cells/µL. < 2 polymorphonucleocytes [PMN]) …
4. Glucose level: >60% of serum glucose.
5. Protein level: < 45 mg/dL.
6. Consider additional tests: CSF culture, others depending on clinical findings.

Why is a lumbar puncture done between L3 and L4?

Since the spinal cord ends as a solid structure around the level of the second lumbar vertebra (L2) the insertion of a needle must be below this point, usually between L3 and L4 (Fig 2). The spinal cord continues below L2 down into the sacrum as many separate strands of nerve pathways, the cordae equina, bathed in CSF.

Can High BP cause intracranial pressure?

Increased ICP can result from bleeding in the brain, a tumor, stroke, aneurysm, high blood pressure, or brain infection. Treatment focuses on lowering increased intracranial pressure around the brain.

How do you calculate L3 and L4 space?

Wearing nonsterile gloves, locate the L3-L4 interspace by palpating the right and left posterior superior iliac crests and moving the fingers medially toward the spine (see the image below). Palpate that interspace (L3-L4), the interspace above (L2-L3), and the interspace below (L4-L5) to find the widest space.

When is a lumbar puncture contraindicated?

Absolute contraindications for performing a LP include infected skin over the puncture site, increased intracranial pressure (ICP) from any space-occupying lesion (mass, abscess), and trauma or mass to lumbar vertebrae.

What level does spinal cord end?

The spinal cord tapers and ends at the level between the first and second lumbar vertebrae in an average adult. The most distal bulbous part of the spinal cord is called the conus medullaris, and its tapering end continues as the filum terminale.