Horner's syndrome laboratory findings

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

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Laboratory Findings

Three tests are useful in confirming the presence and severity of Horner's syndrome:

1. Cocaine drop test - Cocaine blocks the reuptake of norepinephrine resulting in the dilation of a normal pupil. The pupil will fail to dilate in Horner's syndrome.
2. Paredrine test
3. Dilation lag test