Table 1.

Intra- and inter-assay imprecision calculated using pooled sera with a low, medium, and high parathyroid hormone concentration (pg/mL). SD: standard deviation; CV: coefficient of variation.

Parameter	Low	Medium	High
Intra-Assay
Mean	3.65	24.12	102.90
SD	0.35	1.17	3.28
CV	9.61	4.85	3.19
Inter-Assay
Mean	3.07	21.21	92.46
SD	0.47	2.26	8.56
CV	15.28	10.63	9.26