Diagnostic medical sonographers must complete 24 continuing education credits every two years to remain certified. To maintain ARDMS credentials, sonographers must earn at least 30 continuing medical education (CME) credits in a 3-year period and pay an annual renewal fee.nly a few states require sonographers to be licensed. While state requirements can vary, a professional certification from a national credentialing organization is often required to become licensed.
[ edit intro ]. The Allegheny Portage Railroad was the section of the Pennsylvania Main Line of Public Works that traversed the Allegheny Mountains in Pennsylvania. It consisted of alternating level and inclined plane stretches of rail, pulling canal boats on carriages.
The Underground Railroad was a metaphor used by northern abolitionists and free blacks to describe and publicize their efforts at helping runaway slaves during the years before the Civil War.