How to parse the Multiple OBR Segment in HL7 using

Question

How to parse the Multiple OBR Segment in HL7 using HAPI using terser

I have sample hl7 message like this

MSH|^~\&|SENDERAPP|SENDERFAC|COVCDR|COVCDR|20130212221503||ORU^R01|1676326503009050|P|2.5
PID|1||MRN101||DOE^JOHN^A||20000101|M||W|1 Campus Martius^^Detroit^MI^48226||[phone]||EN|S|||111-11-1111|||H
PV1|1|U| 12E^1211^01||||1689885733^ORANGE TEAM, OMNI|||Med||||Tra|||99999999^SMITH^KEVIN^^^^MD|I|000000000000|YY|P||||||||||||||||||||Ac|||20130224080500
ORC|RE|F78520223|000000000^LA||CM||||20130226020200||||  PICU|||^RESULT PERFORMED|||RES
OBR|1|F78520223|1305611705^LA|0101301^COMPLETE BLOOD COUNT^COMPLETE BLOOD COUNT|||20130226010600|20130226020200||2632||||20130226014200||333333^GEORGE, BOB|||||0001305611705|20130226020200|||F||^^^20130226043000^^EA~^^^^^EA
OBX|1|NM|0106550^WHITE BLOOD CELL COUNT^WHITE BLOOD CELL COUNT||7.9|10e9/L|4.3-11.0||||F|||20130226020200|34333^Kelly, Bacon^^00010033^MOLIS XE2|RES
OBX|2|NM|0104650^RBCx10e12^RBCx10e12||4.09|10e12/L|4.53-5.73|L|||F|||20130226020200|34333^Kelly, Bacon^^00010033^MOLIS XE2|RES
OBX|3|NM|0102150^HEMOGLOBIN^HEMOGLOBIN||12.9|g/dL|13.6-17.4|L|||F|||20130226020200|34333^Kelly, Bacon^^00010033^MOLIS XE2|RES
OBX|4|NM|0102100^HEMATOCRIT^HEMATOCRIT||37.5|%|40.7-50.8|L|||F|||20130226020200|34333^Kelly, Bacon^^00010033^MOLIS XE2|RES
OBX|5|NM|0103500^MEAN CORPUSCULAR VOLUME^MEAN CORPUSCULAR VOLUME||91.7|fL|81.6-96.8||||F|||20130226020200|34333^Kelly, Bacon^^00010033^MOLIS XE2|RES
NTE|1||Test performed at Tulsa

I am using terser.get("/.OBX-3-1")); to access OBX parent segment. How to get to child OBX segments using terser

Answer 1

I think you should use terser.get(/OBX(repetition)-3-1). For instance, terser.get(/OBX(2)-3-1) should be equal to 0102150. Remember that the repetition starts at 0, so OBX(2) refers to OBX|3|NM|0102150^HEMOGLOBIN^...

You can find some hapi terser example about repetitions here:

I have written a couple of post about this issue. You can find them:

http://ignaciosuay.com/how-to-use-hapi-terser-with-hl7/

http://ignaciosuay.com/how-to-set-repetitions-in-hl7-messages-using-hapi-terser/

Cheers Ignacio

Answer 2

OBX is nested inside an OBSERVATION group (which in return is nested in other groups). Actually, not the OBX segment is repeatable but the OBSERVATION group is. So your terser expression would be something like terser.get("/.OBSERVATION(i)/OBX-3-1");, where in your case i runs from 0 to 3.

cheers christian