Q Sign 

In medical slang, the Q-sign is a dead patient or a patient with extreme morbidity. The Q is a reference to the patient's tongue hanging out of its mouth, making a Q sign.

Nurse: Get the paddles, I'm gettin a Q sign from the new admit!

Q Sign by Mister Boo September 13, 2009

Q-sign

Medical lingo. An extension of the O-sign from the book, The House of God. An ill patient in an ICU setting has their mouth hanging open, with their tongue hanging out, stimulating a capital Q visually. It is quietly considered along a decline from O-sign, to Q-sign, to intubation or death.

"Mr Jones in 7 does not have long to live. He progressed from O to Q-sign this morning"

Q-sign by Cultural_Observer December 31, 2021