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Immunology Laboratory

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Orexin/hypocretin is a CSF peptide that is severely reduced or absent in narcolepsy with cataplexy.

Specimen requirements

CSF 2ml


50 UKP - UK NHS, International and Private

Laboratory turnaround time

42 working days

Laboratory method

Radioimmunoassay (RIA)

Reference range/units

Not applicable

Associated tests

Not applicable

Sample stability

4 months at 2-8ÂșC

Shipping and storage

UK and Ireland

Ambient temperature and first class post. Hays DX users please enquire via email below.


Ambient temperature if courier will deliver within 72 hours otherwise consider refrigerated transport. Freezing is not a requirement.

Ensure delivery Monday to Friday 09:00 - 17:30.

Other information

Please retain a frozen CSF sample at source.

Further information and contact details

For further information, email

Last reviewed:13 September 2022