Table 1.

Comparison of I-PTH results obtained in 112 uremic samples using three commercial assays.

I-PTH value1 pmol/LnAssay and reference range
Nichols,1.0–6.8 pmol/LIncstar,1.3–5.7 pmol/LDSL 0.9–5.8 pmol/L
<20587.1 ± 6.35.5 ± 5.126.9 ± 7.23
20–402227.4 ± 5.325.8 ± 7.131.1 ± 10.3d,e
>403274.7 ± 25.558.0 ± 18.7290.5 ± 32.2b,c
  • 1 Value using Nichols assay. Results are means ± SD. Statistical analysis by Friedman non-parametric repeated measures test followed by Dunn’s multiple comparisons test.

  • 2 Nichols vs Incstar or DSL, P <0.001.

  • 3 Incstar vs DSL, P <0.001.

  • 4 Incstar vs DSL, P <0.01.

  • 5 Nichols vs DSL, P <0.05.