Introduction

Question 1

What does xanthochromia from an LP indicate?

Answer 1

Xanthochromia is a pale pink/orange discoloration of LP sample from lysed cells in the setting of subarachnoid hemorrhage.

On the contrary, blood from a traumatic tap would not give xanthochromia–this is a way to differentiate blood from SAH and traumatic tap.

Slide 14

Question 2

List some contraindications to an LP.

Answer 2

1) ICP due to mass lesion and/or edema - LP can result in herniation.
2) Obstructive hydrocephalus
3) Coagulopathy or therapeutic anticoagulation
4) Thrombocytopenia
5) Spinal epidural abscess

Slide 14