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Functional
Neurological
Disorder
The CommonNeurologicalConditionYou'veNever Heard
Of
Functional NeurologicalDisorder (FND)is alsocalled:
oFunctionalMovement Disorder
oFunctionalNeurologicalSymptoms
oFunctionalNeurologicalSymptomDisorder
oNon-EpilepticAttackDisorder
oNon-EpilepticSeizures
oPsychogenicSeizures
oPsychogenicNon-EpilepticSeizures
oDissociativeSeizures
oConversionDisorder
This Photo by Unknown Author is licensed under CC BY-NC-ND
Testing
As with most aspects of FND, testing is also lacking.
Patients often undergo unnecessary tests to rule out
otherdiagnoses. Onetest that is often used to
diagnose Functional Neurological Disorderis the
Hoovertest, also known as Hoover’s sign. Another
positive sign of functional weakness is called
collapsing weakness.
Hoover’sSign
In a patient with functional limb weakness/paralysis,
they are unable to push down on the bed when
asked. However, when they try to push up against
something with the other leg, they areable to push
down with the weak leg.
ThisPhoto by Unknown Authorislicensedunder CC BY-SA
CollapsingWeakness
Collapsing weakness is where a patient is askedto
movethe affected limb and finds it collapses. They
may find this gets worsethe more they try. This is
often interpreted as the patient not trying, but this is
something that is out of their control.
More Resourceson
FND
• neurosymptoms.org
• National Organisation for Rare Disorders
• FND Hope
Check out my Functional Neurological Disorder
Resources page for a full list.

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Tests for Functional Neurological Disorder

  • 2. Functional NeurologicalDisorder (FND)is alsocalled: oFunctionalMovement Disorder oFunctionalNeurologicalSymptoms oFunctionalNeurologicalSymptomDisorder oNon-EpilepticAttackDisorder oNon-EpilepticSeizures oPsychogenicSeizures oPsychogenicNon-EpilepticSeizures oDissociativeSeizures oConversionDisorder This Photo by Unknown Author is licensed under CC BY-NC-ND
  • 3. Testing As with most aspects of FND, testing is also lacking. Patients often undergo unnecessary tests to rule out otherdiagnoses. Onetest that is often used to diagnose Functional Neurological Disorderis the Hoovertest, also known as Hoover’s sign. Another positive sign of functional weakness is called collapsing weakness.
  • 4. Hoover’sSign In a patient with functional limb weakness/paralysis, they are unable to push down on the bed when asked. However, when they try to push up against something with the other leg, they areable to push down with the weak leg. ThisPhoto by Unknown Authorislicensedunder CC BY-SA
  • 5. CollapsingWeakness Collapsing weakness is where a patient is askedto movethe affected limb and finds it collapses. They may find this gets worsethe more they try. This is often interpreted as the patient not trying, but this is something that is out of their control.
  • 6. More Resourceson FND • neurosymptoms.org • National Organisation for Rare Disorders • FND Hope Check out my Functional Neurological Disorder Resources page for a full list.