Factors influencing isoprotein dependency of polyclonal apolipoprotein(a) assays.

6 h-incubation assay correlated strongly (r 0.98) with corresponding 3-h incubation results. The DR assay can measure low concentrations of renin in samples with PRA 0.65 ng mL 1 h 1 with a good correlation and low CV. This suggests that the DR method is an adequate method for measuring samples with low renin concentrations and is possibly a suitable alternative for measuring renin in black individuals. The advantage of higher throughput with the DR assay could facilitate the measurement of renin in population-based studies and aid in the screening for secondary forms of hypertension, including primary aldosteronism and Liddle syndrome.