Existing Data Sources in Clinical Epidemiology: Laboratory Information System Databases in Denmark

Figures & data

Table 1 Basic Characteristics of the Two Laboratory Databases in Denmark

	LABKA	RLRR
Geographical Coverage and Start of Data Collection
North Denmark region	1997	October 2013
Central Denmark region	2000	November 2013
Region of Southern Denmark	–	July 2015
Region of Zealand	–	October 2013
Capital region of Denmark	–	October 2014
Key Variables
Patient identification number	+	+
Sampling hour and minute	+	+
NPU or Danish modified code	+	+
Biomarker name	+	–
Laboratory ID	Incomplete	+
Requisitioner ID	Incomplete	+
Numeric results	+	+
Text-written results	+	“positive”, “negative”, “ABO+RhD blood types”
Units	+	+
Reference limits/cut-offs	+	+

Abbreviations: LABKA, Clinical Laboratory Information System Research Database at Aarhus University; NPU, Nomenclature, Properties, and Units; RhD, Rhesus D blood type; RLRR, Register of Laboratory Results for Research.

Figure 1 Number of test results and unique personal identification (CPR) numbers of the 20 most frequent laboratory tests performed in the Central Denmark region, 2008–2018.

Abbreviations: ALAT, alanine aminotransferase; EVF, erythrocyte volume fraction; HDL, high-density lipoprotein; MCV, mean corpuscular volume; RDW, red blood cell distribution width; TSH, thyroid stimulating hormone; WBC, white blood count.