Table 1 Analytical recovery of P4 from urine in the 2 automated assays. SD; standard deviation. Architect: Abbott Architect progesterone chemiluminescent microparticle immunoassay, Cobas: Roche Cobas electrochemiluminescence immunoassay, P4: progesterone.

From: Confirmation of ovulation from urinary progesterone analysis: assessment of two automated assay platforms

P4 added, nmol/L % recovery, mean (SD)
Cobas Architect
Male
12.5 170 (41.7) 113 (13.3)
6.25 (x2 dilution) 160 (30.0) 106 (16.4)
3.13 (x4 dilution) 153 (26.6) 109 (16.7)
1.56 (x8 dilution) 143 (22.0) 112 (67.0)
  1. N = 7.