Section 904 - Examinations by health appraisal1. Each principal of a public school, or his or her designee, shall report to the director of school health services having jurisdiction over such school, the names of all students who have not furnished health certificates as provided in section nine hundred three of this article, or who are children with disabilities, as defined by article eighty-nine of this chapter, and the director of school health services shall cause such students to be separately and carefully examined and tested to ascertain whether any student has defective sight or hearing, or any other physical disability which may tend to prevent him or her from receiving the full benefit of school work, or from requiring a modification of such work to prevent injury to the student or from receiving the best educational results. Each examination shall also include a calculation of the student's body mass index (BMI) and weight status category. For purposes of this section, BMI is computed as the weight in kilograms divided by the square of height in meters or the weight in pounds divided by the square of height in inches multiplied by a conversion factor of 703. Weight status categories for children and adolescents shall be as defined by the commissioner of health. In all school districts, such physician, physician assistant or nurse practitioner shall determine whether a one-time test for sickle cell anemia is necessary or desirable and he or she shall conduct such tests and the certificate shall state the results. If it should be ascertained, upon such test or examination, that any of such students have defective sight or hearing, or other physical disability, including sickle cell anemia, as above described, the principal or his or her designee shall notify the parents of, or other persons in parental relation to, the child as to the existence of such disability. If the parents or other persons in parental relation are unable or unwilling to provide the necessary relief and treatment for such students, such fact shall be reported by the principal or his or her designee to the director of school health services, whose duty it shall be to provide relief for such students. Each school and school district chosen as part of an appropriate sampling methodology shall participate in surveys directed by the commissioner of health pursuant to the public health law in relation to students' BMI and weight status categories as determined by the examination conducted pursuant to this section and which shall be subject to audit by the commissioner of health. Such surveys shall contain the information required pursuant to this subdivision in relation to students' BMI and weight status categories in aggregate. Parents or other persons in parental relation to a student may refuse to have the student's BMI and weight status category included in such survey. Each school and school district shall provide the commissioner of health with any information, records and reports he or she may require for the purpose of such audit. The BMI and weight status survey and audit as described in this section shall be conducted consistent with confidentiality requirements imposed by federal law. Data collection for such surveys shall commence on a voluntary basis at the beginning of the two thousand seven academic school year, and by all schools chosen as part of the sampling methodology at the beginning of the two thousand eight academic school year. The department shall also utilize the collected data to develop a report of child obesity and obesity related diseases.2. Notwithstanding the provisions of subdivision one of this section, no examinations shall be required pursuant to this section where a student or the parent or person in parental relation to such student objects thereto on the grounds that such examinations conflict with their genuine and sincere religious beliefs.