Hello, as I’ve reviewed modules and questions, I noticed a discrepancy in ICP values between modules – module 4 for brain injuries lists normal ICP as 0-10 mmHg and the values in module 14 lab values chart say 5-15 mmHg is normal. Which one is accurate? Thank you!
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 : 7-15 mmHg
– Standing adult : -10 mmHg
– Normal values in adults and older children : <10-15 mmHg
- Mild intracranial hypertension : 20-30 mmHg
- Severe, life-threatening hypertension : >40 mmHg
 Rangel-Castillo L, Gopinath S, Robertson CS. Management of intracranial hypertension. Neurol Clin. 2008;26(2):521-541.
 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.