An impediment to the use of saliva by clinicians is a lack of reliable normative data regarding the concentration ranges to be expected under various physiological conditions.
Little normative information is available concerning expected concentrations of the major reproductive steroids in saliva during pregnancy and the extended postpartum.
Norm: population based normative values.
In a report of 141 men taking part in a normative aging study, with mean blood lead concentrations of 5.5 μg/dL (Payton et al. 1998), higher concentrations of blood and bone lead were associated with poorer performance on cognitive tests.
We sought to determine a large dataset of stringently-defined normative data for CSF lactate and pyruvate concentrations and CSF L/P ratios.
The plasma samples were run in duplicate and data reported back as concentrations (average of two independent measures), together with normative data such as least detectable dose (determined as the mean ±3 standard deviations of 20 blank readings) and lower assay limit (assay working sensitivity defined by the lowest concentration calibrator used for quantitation).
However, serum concentrations in the present study were compatible with typical normative values for late gestation, and is it not obvious why any dampening attributable to the cross-sectional design would affect only the saliva.
Thus, Acquavella et al. (2004) needed to compare the 24-hr creatinine collection (urine creatinine concentration × urine volume) to each individual's normative value of daily creatinine excretion based on age, sex, and body surface area (Cockcroft and Gault 1976).
Currently, most studies on reference intervals for serum OC concentrations focused on premenopausal women [ 19, 22, 23, 26], while normative data for postmenopausal women [ 21] and men [ 16, 21] are sparse.
Hormone concentrations are sometimes measured in very preterm infants, however there are little normative data available to be able to interpret the results.
