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BizTalk HL7 Interview Questions & Answers? Question 1 : What is HL7? Answer : Health Level Seven or HL7 refers to a set of international standards for transfer of clinical and administrative data between software applications used by various healthcare providers. Question 2 : What is the difference between HL7 version 2 (V2) and HL7 version 3 (V3)? Answer : HL7 version 2 : • Not "Plug and Play" - it provides 80 percent of the interface and a framework to negotiate the remaining 20 percent on an interface-by-interface basis • Historically built in an ad hoc way because no other standard existed at the time • Generally provides compatibility between 2.X versions • Messaging-based standard built upon pipe and hat encoding HL7 version 3 : • Approaching "Plug and Play" - less of a "framework for negotiation" • Many decades of effort over ten year period reflecting "best and brightest" thinking • NOT backward compatible with V2 • Model-based standard built upon Reference Information Model (RIM) provides consistency across entire standard Question 3 : What are Z segments? Answer : Z segments contain clinical or patient data that the HL7 Standard may not have defined in other areas. Essentially, it is the "catch all" for data that does not fit into the HL7 Standard message definitions. Z segments can be inserted in any message at any time, and Z segments can carry any data you want. In HL7 messaging, all Z segments within it start with the letter "Z". Z segments are one of the reasons why the HL7 Standard is sometimes called the flexible standard. The HL7 Standard is a framework for negotiation, and Z segments is an area ripe for negotiation between healthcare vendors and systems. Question 4 : What does BTAHL72VXCommon project contain? Answer : It contains Schema for MSH segent and HL7 acknowledgements. Question 5 : What does BTAHL7231common project contain? Answer : It contains the definitional schema referred to by all version 2.31 message schemas.