North Carolina officials "have not articulated how the speech-and-display requirements address the stated concern in reducing compelled abortions, and none is immediately apparent," the judge wrote in a preliminary injunction.
Attorneys for abortion providers and abortion-rights groups argued the ultrasound directives, carried out at least four hours before the scheduled procedure, actually would subject women to emotional pain and violate the medical ethics of doctors who feel the government is forcing them to carry out the Republican-controlled Legislature's ideology.
"If the ultrasound requirements were put into effect, this law would place doctors in a murky legal situation and inflict unnecessary harm on women," said Katy Parker, legal director of the American Civil Liberties Union of North Carolina Legal Foundation "The state should not be using women's bodies as political pawns, as this law clearly seeks to do."
The judge, nominated by President Obama last year, allowed other parts of the law to be enforced, including a 24-hour waiting period to make information about abortion risks and alternatives available. The abortion providers who sued didn't specifically challenge the waiting period.
"The bulk of the bill was upheld," said House Majority Leader Paul Stam, R-Wake, a key proponent of the law.
Stam said the 24-hour waiting period would put North Carolina on par with more than 20 other states that have similar waiting times. Based on Mississippi's abortion law, Stam predicted that 10 percent of women who prepare to have an abortion in North Carolina will change their mind.
Noelle Talley, a spokeswoman for the state attorney general's office, said late Tuesday its attorneys were reviewing the ruling.
State medical rules already required abortion providers to perform ultrasounds before an abortion to determine the gestational age of the fetus.
The abortion bill became law in July when the Legislature overturned a veto by Democratic Gov. Beverly Perdue, who said the bill was extreme and encroached upon the doctor-patient relationship.
The judge planned another hearing in December.
A federal judge in August blocked a Texas law that would require women seeking an abortion to view a sonogram and make the heartbeat audible.