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Updated cerebrospinal fluid total protein reference values improve chronic inflammatory demyelinating polyneuropathy
Ari Breiner1,2, Pierre R Bourque1,2, Jeffrey A Allen3,4
1Department of Medicine, Division of Neurology, The Ottawa Hospital, University of Ottawa, 1053 Carling Ave, Room ES-08, Ottawa, M5G 2C4, Ontario, Canada.
Introduction:
Recent literature has concluded that cerebrospinal fluid total protein (CSF-TP) upper reference limits (URL) should be higher than 45 mg/dl and stratified by age.
Methods:
Data-driven URLs were applied to the analysis of a cohort of patients with correctly and incorrectly diagnosed chronic inflammatory demyelinating polyneuropathy (CIDP). Descriptive statistics were calculated, and exploratory analyses were used to test the impact of different CSF-TP URLs on sensitivity and specificity of CIDP diagnosis.
Results:
The adoption of higher and age-dependent CSF-TP URLs reduced the sensitivity of CSF analysis slightly (from 95% to 84%-86%); however, the overall CIDP detection rate was unchanged. Twelve of 36 (33%) false-positive diagnoses occurred with CSF-TP elevation as the sole supportive criteria. By applying updated CSF-TP URLs, the specificity of CSF analysis increased from 39% to 57%-64%.
Discussion:
Implementation of data-driven CSF-TP URLs improves CIDP diagnostic specificity without compromising sensitivity, thereby lessening CIDP misdiagnosis. Muscle Nerve 60: 180-183, 2019.
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