This is also called the foraminal compression test.
This test done in upper limbs is considered equivalent to SLR in lower limbs.
This is done to test cervical nerve root irritability in neck.
Standing behind the patient, head is bent backwards and flexed laterally to the symptomatic side.
This posture may elicit pain or paresthesia in the involved root.
If pain or paresthesia are not seen then a downward compression over the vertex is given to aggravate the foraminal compression so as to elicit the pain and paresthesia