Table 3.

Lab test in EHR represented as a document-based data store.

{“DOCUMENT ID”:“1”	{“DOCUMENT ID”:“2”	{“DOCUMENT ID”:“3”
“PATIENT ID”: “PT001”	“PATIENT ID”: “PT001”	“PATIENT ID”: “PT001”
“TEST CODE”: “26464-8”	“TEST CODE”: “59408-5”	“TEST NAME”: “Covid19 pcr”
“TEST NAME”: “White blood cell”	“TEST NAME”: “Oxygen saturation”	“TEST RESULT”: “negative”
“TEST TYPE”:“HEMATOLOGY”	“TEST TYPE”:“BLOOD GAS”	“TEST DATE”: 2020-05-21}
“TEST RESULT”: 9.4	“TEST RESULT”: 99.0
“TEST UNIT”: “$\times {10}^3/\mathit{ul}$”	“TEST UNIT”: “$\%$”
“TEST DATE”: 2018-06-04}	“TEST DATE”: 2019-08-05}