“…The variation in baseline PTH might be secondary to population norms, or more likely to the differences in vitamin D level and incidence of deficiency. 17 Therefore, the use of percent of change, rather than absolute PTH values, would probably account for this variable. Al-Dhahri et al 10 tested the accuracy of post thyroidectomy calcium level and PTH level at different times post-operatively, they found that PTH measurements at 6, 12, 20, 32, and 44 hr had high predictive probability to detect clinical hypocalcemia; Despite the fact that Ca accuracy markedly improved in the second day, it never reached accuracy of PTH measurement.…”