We currently use Centaur for male and female testosterone, but lack a
normal/low female testosterone control level. The ligand controls supplied
by Bayer only go as low as 3.6 nmol/l. We changed from DPC CAC testosterone
to Centaur, and note an increase in the number of female elevated
testosterone, i.e around 3.8-4.0 nmol/l, so either we missed females before,
or have the wrong reference range (0.2-3.0) or we have interfering
substances. Theorists will say we should confirm with extraction methods,
but who is doing that nowadays? We know our CVS at the low end are about
15%, and so feel a lower control would be helpful. Has anyone located such a
control?
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