Reference values for 27 clinical chemistry tests in 70-year-old males and females.
BACKGROUND
Reference values are usually defined based on blood samples from healthy men or nonpregnant women in the age range of 20-50 years. These values are not optimal for elderly patients, as many biological markers change over time and adequate reference values are important for correct clinical decisions.


OBJECTIVE
To validate NORIP (Nordic Reference Interval Project) reference values in a 70-year-old population.


METHODS
We studied 27 frequently used laboratory tests. The 2.5th and 97.5th percentiles for these markers were calculated according to the recommendations of the International Federation of Clinical Chemistry on the statistical treatment of reference values.


RESULTS
Reference values are reported for plasma alanine aminotransferase, albumin, alkaline phosphatase, pancreas amylase, apolipoprotein A1, apolipoprotein B, aspartate aminotransferase, bilirubin, calcium, chloride, cholesterol, creatinine, creatine kinase, C-reactive protein, glucose, gamma-glutamyltransferase, HDL-cholesterol, iron, lactate dehydrogenase, LDL-cholesterol, magnesium, phosphate, potassium, sodium, transferrin, triglycerides, urate and urea.


CONCLUSIONS
Reference values calculated from the whole population and a subpopulation without cardiovascular disease showed strong concordance. Several of the reference interval limits were outside the 90% CI of a Scandinavian population (NORIP).
Department of Medical Sciences, Uppsala University, Sweden.
Lena
L
Carlsson
Lars
L
Lind
Anders
A
Larsson
D000367:Age Factors; D000368:Aged; D015415:Biomarkers / Q000378:metabolism*; D019963:Clinical Chemistry Tests; D015331:Cohort Studies; D005260:Female; D015577:Geriatric Assessment; D006801:Humans; D008297:Male; D012016:Reference Values; D015203:Reproducibility of Results; D012737:Sex Factors; D013548:Sweden
D015415:Biomarkers