Table 1.

Mean PTH results in pmol/L (with 95% confidence intervals) obtained on the IMMULITE 2000.1

SampleTime to analysis
0–3 h24 h48 h72 h
EDTAcold39.5 (26.4–52.6)38.4 (25.8–50.9)38.7 (26.1–51.2)38.7 (25.9–51.5)
EDTART43.4 (29.1–57.8)47.0 (31.3–62.8)247.2 (31.5–63.0)245.4 (30.3–60.4)
SSTcold30.7 (9.2–36.5)31.4 (8.5–32.8)31.3 (8.0–31.0)30.5 (6.8–27.5)
SSTRT30.1 (20.3–39.9)28.0 (19.2–36.7)24.9 (17.3–32.5)222.6 (15.6–30.0)2
SSTspuncold30.1 (20.3–39.9)30.4 (20.6–40.2)31.0 (20.8–41.2)29.6 (20.0–39.1)
  • 1 Manufacturer’s reference intervals are 1.3–6.8 pmol/L for serum and 1.7–9.2 pmol/L for plasma.

  • 2 Significantly different from baseline: bP = 0.006; cP = 0.004; dP = 0.04. All differences not indicated are not significant.