The laboratory that creates the document MUST be declared as Custodian. The GLN is the primary key and thus the unique identification of the laboratory. If the lab services are to be refunded by the insurance, the SASIS number (ge:ZSR / fr:RCC) MUST be declared in the same element as the GLN as follows. Labor PipetteReagenziumstrasse3218888AnalyzerstadtCHA public telephone number in the international format is required.A public address is required.The specification of GS1 GLN is required. If it is not (yet) known, this must be declared using nullFlavor. Temporarily unknown, will be filled later.OID for GS1 GLNThe GS1 GLN of the laboratory or the doctor's office (in the case of individual practices, the doctor's GLN).Either the GS1 GLN or nullFlavor='NAV' is required.SASIS number (ge:ZSR / fr:RCC), if the lab services are to be refunded by the insurance.OID for SASIS number (ge:ZSR / fr:RCC).SASIS number (ge:ZSR / fr:RCC) of the laboratory or the physician.Name of the laboratory.Means of communication of the laboratory (phone., eMail, ...).Address of the laboratory.