What is the test for medical negligence in the context of medical malpractice cases?

know "that inmates face a substantial risk of serious harm and disregard[] that risk by failing to take reasonable measures to abate it." Farmer v. Brennan, 511 U.S. 825, 847 (1994).

To maintain an Eighth Amendment claim based on prison medical treatment, an inmate must show (1) a serious medical need by demonstrating that failure to treat a prisoner's condition could result in further significant injury or the unnecessary and wanton infliction of pain, and (2) a deliberately indifferent response by defendant. Jett v. Penner, 439 F.3d 1091, 1096 (9th Cir. 2006). The deliberate indifference standard is met by showing (a) a purposeful act or failure to respond to a prisoner's pain or possible medical need and (b) harm caused by the indifference. Id.