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Hi Megan! Thanks for this question! Normal values for ICP vary slightly depending on the reference. Generally, values less than 15 mmHg are considered normal. Values greater than 20-25 mmHg usually require treatment. On the NCS exam, they likely won’t ask questions requiring you to determine next steps on the gray areas (10-20 mmHg).

Here are a few values from the literature:
– Supine adult [1]: 7-15 mmHg
– Standing adult [1]: -10 mmHg
– Normal values in adults and older children [2]: <10-15 mmHg
- Mild intracranial hypertension [2]: 20-30 mmHg
- Severe, life-threatening hypertension [2]: >40 mmHg

[1] Rangel-Castillo L, Gopinath S, Robertson CS. Management of intracranial hypertension. Neurol Clin. 2008;26(2):521-541.
[2] Haider MN, Leddy JJ, Hinds AL, et al. Intra-cranial pressure changes after mild traumatic brain injury: a systematic review. Brain Inj. 2018;32(7):809-815.