Specializing in pain management?

Hi. I have a ASN and currently work for a Chronic Pain Management Clinic at our hospital. I meet several different criteria annually and have to renew my "hospital specific certification" annually. I've heard of a "pain management certification" out there. I believe it requires at least a BSN.

From the ASPMN:

http://www.aspmn.org/Certification/eligibility.htm

Eligibility Criteria

Eligibility Criteria to Sit for the Pain Management Nurse

Certification Examination (Exam 56)

Hold a diploma, associate, baccalaureate or higher degree in nursing

Hold a current active registered nurse license in one of the 50 states in the U.S. or its territories

Have the equivalent of two years full-time experience practicing as a registered nurse in the United States or its territories

Have practiced in a nursing role which involves aspects of pain management (e.g., pain assessment and management, pain management education, pain research, etc.) at least 2,000 hours in the three years prior to applying to take the examination

Have 30 hours of continuing education in the three years prior to applying to take the examination, of which a minimum of 15 hours must be related to pain management

Can LVN's In Texas Specialize in Pain Management?