Some general advice needed here.
I've a list of laboratories who deal with Analytes(eg, ore, zinc, iron). There could be 200 plus of these. The labs also deal with Matrix(eg, fish, herbs, shellfish).
The way I set it up was:
tblLabs
LabID(PK)
LabName
tblAnalytes
AnalyteID (PK LookUp)...