| Author, date and country | Patient group | Study type (level of evidence) | Outcomes | Key results | Study weaknesses |
|---|---|---|---|---|---|
| UK National External Quality Assessment Scheme for Immunochemistry Working Group, 2003, UK | Review of current recommendations for clinical biochemists in the UK | Review article | Time for formation of bilirubin in CSF.Selection of bilirubin as key determinant | This occurs 9–15 hours after a bleed. Bilirubin is the only product of red cell lysis that occurs solely in vivo | Not systematic review. Basic data on which recommendation not given. |