Table 2.

Concordance in the diagnosis of hypogonadism between LC-MS/MS and RIA methods.a

MethodActual TTLC-MS/MS
≤300 ng/dL>300 ng/dL
Actual TTRIA
    ≤300 ng/dL111 (0.71)a65 (0.15)
    >300 ng/dL45 (0.29)381 (0.85)
Predicted TTLC-MS/MSb
    ≤300 ng/dL96 (0.61)34 (0.08)
    >300 ng/dL60 (0.39)412 (0.92)
  • a Data are n (%).

  • b Predicted TTLC-MS/MS was estimated by Deming equation: ln(TTLC-MS/MS + 10) = 0.87 + 0.87 × ln(TTRIA + 10).