What [USER=38109]@Cataceous[/USER] is trying to communicate is the difference between how your actual serum testosterone (total, free) levels change as a function of nandrolone usage VS what various tests (assays) report as your serum testosterone levels. There's a big difference and one has to be careful in order to differentiate the two.
Different immunoassays may suffer from various amounts of interference. The LC/MS test will physically separate and "fingerprint" testosterone using its unique molecular mass/charge signature so it won't suffer from this interference.
See for example.
[URL unfurl="true"]https://jdos.nicholsinstitute.com/dos/sarasotamemorial/test/116816[/URL]
Methodology
The ADVIA Centaur TSTII assay is a competitive immunoassay using direct chemiluminescent technology.
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3. Samples from patients routinely receiving high-dose biotin therapy may show falsely elevated results. Additional information may be required for diagnosis. A strong interaction with Nandrolone decanoate, 11β-hydroxytestosterone, and 11-keto-testosterone was found. Do not use samples from patients receiving these compounds.
[URL unfurl="true"]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4112981/bin/1472-6890-14-33-S1.xlsx[/URL]
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