N.H. Rev. Stat. Ann. § 130-A:5-a

All health care providers who provide primary medical care shall conduct blood testing of all one and 2-year old patients to determine a blood lead level. A health care provider shall not be liable for not performing a test for blood lead level when a parent or guardian has been informed of the blood test requirement and has refused to consent or has failed to follow through in response to a referral for a test. Nothing in this section shall prevent a health care provider from recommending blood testing for children younger than one year or older than 2 years should circumstances, including potential lead hazard exposures, warrant such testing.