53418-0	Fibroblast growth factor 23.intact [Mass/volume] in Plasma --pre XXX challenge
53419-8	Fibroblast growth factor 23.intact [Mass/volume] in Plasma by Immunoassay --1st specimen post XXX challenge
53420-6	Fibroblast growth factor 23.intact [Mass/volume] in Plasma by Immunoassay --2nd specimen post XXX challenge
53421-4	Fibroblast growth factor 23.intact [Mass/volume] in Plasma by Immunoassay --3rd specimen post XXX challenge
53422-2	Fibroblast growth factor 23.intact [Mass/volume] in Plasma by Immunoassay --4th specimen post XXX challenge
53423-0	Fibroblast growth factor 23.intact [Mass/volume] in Plasma by Immunoassay --5th specimen post XXX challenge
53424-8	Fibroblast growth factor 23.intact [Mass/volume] in Plasma by Immunoassay --6th specimen post XXX challenge
53425-5	Fibroblast growth factor 23 [Units/volume] in Plasma by Immunoassay --pre XXX challenge
53426-3	Fibroblast growth factor 23 [Units/volume] in Plasma by Immunoassay --1st specimen post XXX challenge
53427-1	Fibroblast growth factor 23 [Units/volume] in Plasma by Immunoassay --2nd specimen post XXX challenge
53428-9	Fibroblast growth factor 23 [Units/volume] in Plasma by Immunoassay --3rd specimen post XXX challenge
53429-7	Fibroblast growth factor 23 [Units/volume] in Plasma by Immunoassay --4th specimen post XXX challenge
53430-5	Fibroblast growth factor 23 [Units/volume] in Plasma by Immunoassay --5th specimen post XXX challenge
53431-3	Fibroblast growth factor 23 [Units/volume] in Plasma by Immunoassay --6th specimen post XXX challenge



To generate this list:

	Codes from tx.fhir.org expansion:

		curl -X "POST" "http://tx.fhir.org/r4/ValueSet/\$expand" \
		     -H 'Accept: application/json' \
		     -H 'Content-Type: application/fhir+xml;charset=UTF-8' \
		     -H 'Accept-Charset: UTF-8' \
		     -H 'Accept-Encoding: gzip' \
		     -H 'User-Agent: hapi-fhir-tooling-client' \
		     -d "<?xml version=\"1.0\" encoding=\"UTF-8\"?><Parameters xmlns=\"http://hl7.org/fhir\"><id value=\"exp-params\"/><parameter><name value=\"system-version\"/><valueUri value=\"http://snomed.info/sct|http://snomed.info/sct/731000124108\"/></parameter><parameter><name value=\"includeDefinition\"/><valueBoolean value=\"false\"/></parameter><parameter><name value=\"excludeNested\"/><valueBoolean value=\"false\"/></parameter><parameter><name value=\"valueSet\"/><resource><ValueSet><status value=\"active\"/><compose><include><system value=\"http://loinc.org\"/><filter><property value=\"ancestor\"/><op value=\"=\"/><value value=\"LP31412-7\"/></filter></include></compose></ValueSet></resource></parameter><parameter><name value=\"_limit\"/><valueString value=\"1000\"/></parameter><parameter><name value=\"_incomplete\"/><valueString value=\"true\"/></parameter></Parameters>" \
			-s \
			2>&1 | python3 -c "import sys, json; j = json.load(sys.stdin); print('\n'.join([i['code'] for i in j['expansion']['contains']]));" > tx_expansion.txt


	Codes from loinc.org hierarchy:

		First download https://loinc.org/file-access/download-id/8991/.

		Then run:

			cat MultiAxialHierarchy.csv | grep LP31412-7 | sed 's/.*,\([0-9]*-[0-9]\),.*/\1/' | grep "^[0-9]" | sort > loinc.txt

	Compare:

		diff tx_expansion.txt loinc.txt