Question

A 45-year-old presents with sudden worst headache 2 hours ago; neuro exam normal. What ED diagnostic strategy is guideline-supported to exclude SAH?

Accepted Answer

Noncontrast head CT within 6 hours; if negative, SAH excluded

Answer

Noncontrast head CT within 24 hours is sufficient

Answer

Immediate LP in all suspected cases regardless of CT

Answer

MRI brain without contrast as first test

Answer

Wait 12 hours to allow xanthochromia and then LP only

Practice question

A 45-year-old presents with sudden worst headache 2 hours ago; neuro exam normal. What ED diagnostic strategy is guideline-supported to exclude SAH?