NORCROSS, Ga.--(BUSINESS WIRE)--Guided Therapeutics, Inc., (OTCBB: GTHP) (OTCQB: GTHP), today announced that it has commenced an exchange offer for certain of its outstanding warrants to purchase up to an aggregate of approximately 28.4 million shares of its common stock. The warrants eligible for exchange have an exercise price of $0.65 per share and exercise periods ending on July 26, 2012 or March 1, 2013.