Does anyone on the mailbase know of a lab offering methotrexate using a method which is NOT an immunoassay?

We have some samples from a child post high dose therapy exhibiting funny kinetics and want to make sure that there is no interference in the assay. We use the TDX method.

I am assured that there is no “third space” to explain the kinetics.

Gerald A Maguire

Dept of Clinical Biochemistry and Immunology

Addenbrooke's Hospital

Cambridge

CB2 AN

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