Extracellular Vesicles for HD

Inclusion Criteria: 1. 18 - 75 years of age 2. can provide informed consent 3. able to read and speak English 4. agree to comply with study procedures (including overnight fasting, blood collection and lumbar puncture); and 5. has been diagnosed with HD (HD Carriers) or not been diagnosed with HD (Non-HD Carriers). Exclusion Criteria: 1. younger than 18 or older than 75 years old 2. known to carry an intermediate CAG repeat between 27 and 39 or a larger expansion of 60 or more CAG repeats 3. receiving nutrition through a tube 4. pregnant 5. participated in a clinical drug trial within 30 days 6. use prescribed or non-prescribed medications that are not compatible with collection of the study samples (those that may cause excessive bleeding or prevent clotting) 7. positive for HIV, hepatitis B or C 8. have a confirmed or suspected immunodeficient condition/state 9. significant medical, psychiatric, or neurological morbidity is observed by the clinic physician on the day of sample collection that might impair completion of the study procedures 10. have needle phobia, frequent headache, significant lower spinal deformity or major surgery 11. received antiplatelet or anticoagulant therapy within 14 days prior to sample collection (including but not limited to: aspirin, clopidogrel, dipyridamole, warfarin, dabigatran, rivaroxaban and apixaban) 12. have a blood clotting or bruising disorder 13. do not comply with or are unwilling to undertake any of the study procedures