Expert Field Medical Badge (EFMB) Practice Test 2026 – The All-in-One Study Guide to Achieve Exam Success!

An arterial blood oxygen saturation level above 90% is considered ideal for maintaining adequate oxygenation in patients with impending herniation. This standard is based on the understanding that sufficient oxygen saturation is vital for cerebral perfusion and function, especially in neurological emergencies. Maintaining saturation above 90% helps ensure that the brain receives the necessary oxygen to prevent further damage and complications related to hypoxia.

In patients at risk for herniation, such as those with increased intracranial pressure or traumatic brain injury, adequate oxygenation is crucial. Levels below this threshold can lead to insufficient oxygenation of brain tissue, potentially exacerbating neurological deficits or worsening the patient's condition.

While levels above 95% are generally desirable for overall healthy individuals, in the context of impending herniation, the critical threshold for intervention and stabilization is set at 90%. Levels exceeding 100% are not physiologically possible as humans cannot achieve oxygen saturation levels above 100% without supplemental oxygen; however, excessive oxygen supplementation can sometimes lead to detrimental effects depending on patient circumstances.