Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Horner's syndrome laboratory findings
Introduction
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Laboratory Findings
Laboratory Findings
Three tests are useful in confirming the presence and severity of Horner’s syndrome:
- Cocaine drop test – Cocaine blocks the re-uptake of norepinephrine resulting in the dilation of a normal pupil. The pupil will fail to dilate in Horner’s syndrome.
- Paredrine test
- Dilation lag test
References
References
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]