Abstract:
BACKGROUND AND PURPOSE:Calculation of the cerebrospinal fluid:serum glucose (CSF:SGlu ) ratio is part of the routine cerebrospinal fluid (CSF) work-up. Reference values have been defined for lumbar CSF, but are lacking for ventricular CSF. The objective of this study was to investigate whether the CSF:SGlu ratio is similar in lumbar and ventricular compartments, and to determine cut-off values for CSF:SGlu ratio in ventricular CSF. METHODS:We included CSF samples that were collected by either lumbar puncture or ventricular drainage, with a red blood cell count <500/μL, normal white blood cell count and age-related normal total protein content, with simultaneously withdrawn serum sample and time to laboratory processing of ≤2 h. This resulted in 1808 sample pairs. Glucose concentrations in CSF and serum were measured by enzymatic spectrophotometry. RESULTS:The CSF:SGlu ratio was similar in ventricular and lumbar compartments after controlling for age, sex, time between sample withdrawal and laboratory processing, CSF white blood cell and red blood cell count, CSF total protein and serum glucose concentration using a multiple linear regression model. Lower limits for CSF:SGlu ratio in the ventricular compartment, defined as 5th percentile, were 0.51 for patients with serum glucose concentration < 100 mg/dL, 0.45 for those with serum glucose concentration ≥ 100 mg/dL and <150 mg/dL, and 0.36 for those with serum glucose concentration ≥150 mg/dL. CONCLUSIONS:The CSF:SGlu ratio was similar in the ventricular and lumbar compartments, and depended mainly on time to laboratory processing and absolute serum glucose levels. Previously established lower limits for CSF:SGlu ratio in lumbar CSF can be also applied for ventricular CSF.
journal_name
Eur J Neuroljournal_title
European journal of neurologyauthors
Hegen H,Walde J,Auer M,Deisenhammer Fdoi
10.1111/ene.13513subject
Has Abstractpub_date
2018-02-01 00:00:00pages
373-379issue
2eissn
1351-5101issn
1468-1331journal_volume
25pub_type
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