Tex. Civil Practice and Remedies Code § 74.154

(a) In an action for damages that involves a claim of negligence arising from the provision of emergency medical care in a hospital emergency department or obstetrical unit or in a surgical suite immediately following the evaluation or treatment of a patient in a hospital emergency department, the court shall instruct the jury to consider, together with all other relevant matters:

(1) whether the person providing care did or did not have the patient's medical history or was able or unable to obtain a full medical history, including the knowledge of preexisting medical conditions, allergies, and medications;

(2) the presence or lack of a preexisting physician-patient relationship or health care provider-patient relationship;

(3) the circumstances constituting the emergency; and

(4) the circumstances surrounding the delivery of the emergency medical care.

(b) The provisions of Subsection (a) do not apply to medical care or treatment:

(1) that occurs after the patient is stabilized and is capable of receiving medical treatment as a nonemergency patient;

(2) that is unrelated to the original medical emergency; or

(3) that is related to an emergency caused in whole or in part by the negligence of the defendant.