“…It has been reported that 59-80% of patients with haemorrhage have blood or xanthochromia in their CSF (Krabbe & Jorgenson 1931, Aring & Merritt 1935, Weisberg 1979, Harrison 1980, Britton et al 1983. Therefore the CSF examination as a test for haemorrhage may be specific (about 95%, Britton et al 1983) but has a false-negative rate of 20-40%.…”