Ohio Rev. Code § 3709.23
Each board of health of a city or general health district may provide for the carrying on of such laboratory work as is necessary for the proper conduct of its work. It may establish a district laboratory or may contract with any existing laboratory within or convenient to the district for the performance of such work or may unite with another district in the establishment of a joint laboratory. All state institutions supported in whole or in part by public funds shall furnish such laboratory service as may be required by any board under terms to be agreed upon. Any contract for the furnishing of laboratory service to a board and any proposal for the establishment of a joint laboratory shall be subject to the approval of the director of health. In the operation of such laboratories standard methods approved by the director shall be used.
R.C. §3709.23