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Methamphetamine (also called meth, ice, crystal, crack, P, Tina)

can we use amphetamine cassette  to detect methamphetamine?

No you cannot!!!!!

Why we can't use amphetamine cassette  to detect methamphetamine?

It is very simple lets talk about the mechanism of work of the rapid test Lateral flow/Immune assay is an antibody/antigen. 

Every material has its own (AG) and with a simple change in the structure of the material the (AG) will change and the need for new (ab) with fitting attach complex is needed. 

what is chemical formula of methamphetamine and amphetamine?

So lets talk about the chemical structure of methamphetamine and amphetamine  The structure look very similar but with an extra methyl group So the ag is changing.

so what is the ag that the cassette  searching ??

it searches for the metabolism of amphetamine and methamphetamine.

What is the metabolism of amphetamine???? And what is the metabolism of methamphetamine?????

First, lets talk about amphetamine metabolism It gives D and L-amphetamine Same for methamphetamine it gives D/L Methamphetamine.

Lets take a look at the pamphlet of amphetamine cassette  There is no cross reactivity with D/L Methamphetamine.

Lets take look at the pamphlet of methamphetamine  cassette  There is no cross reactivity with D and L-amphetamine.

Not :If the patient took pure MET, AMP cassette will give negative results.

If the patient took some mixed drugs: MET but mixed some AMP, then AMP will also give a positive result.

But we haven’t met the case, both MET and AMP positive by now.