Helo, may I ask the reason for the question?
Was this sustained release medication?
The problem is that the body metabolizes drugs differently. Sustained and immediate release will have different profiles, and individuals will handle them differently based on factors including kidney function as well as liver enzyme profiles.
A specific answer to your question is not possible based just on the drug level without further information.
The half life for amphetamine is about 10 hours, so the timing of the original consumption as well as when the blood test was taken is important. Peak levels for therapeutic dose of 20mg for a group of adults varied from 2000 to 6000ng/ml.
So the dose level stated suggests a lower dose or a longer time period. As there are so many confounding factors, I am sorry that at the moment I cannot be more specific.
I am afraid that my resources do not allow me to make a more accurate prediction. pH and dilutional effects of urine, serum protein levels and binding are other factors that cause an inability to be more accurate.
If this is your urine sample, then it is easier to correlate the actual amount taken and the urine result because the starting point is known. If this is not your urine sample, then anyone analyzing the results would be considering whether this was to prove an overdose, or to just confirm that the patient is using their medication as prescribed.
To be honest, with this small amount of drug and the fact it was over 24 hrs after taking before sample checked then it would be difficult to be 100% sure which was taken. As the level was not overly high then 10mg is most likely.
Do you have any other capsule left? We can identify capsules by shape, size, color and markings.
Yes because peak would have occurred long before the urine was collected. Absorption is also affected by presence of food (or not) in the gut.
If you recognized the appearance then that seems appropriate
You can look at all the range at this page here
You can see that the color is easy to differentiate between the strengths.
Why is the exact dose so important?
Yes, but why is knowing the exact dose important.... is it a legal matter?
If you took a dose that was not prescribed, then the consequences are the same regardless of dose.
If this was something that you needed to know absolutely then you would have needed testing at a much earlier stage because in medicine we use two timings. Peak and trough levels (depending on the drug), having a test so far after the original capsule adds a high degree of uncertainty.
As I have stated, the levels are difficult to predict with all the various factors. I have spent a lot of time looking up various resources and pharmacology textbooks. I regret that I will not be able to commit to a specific answer between 10 and 30.
Your individual metabolism and food intake on the night means that your levels might be different to another taking exactly the same dose.
We cannot pin down the exact information between 10-30mg on a level that was taken so far after dosing.
If this was something that you bought without prescription, there is also no guarantee that the stated dose was the actual contents.
No toxicologist, there is another expert with experience of drug testing, I'll send him a message although I do not know when he will be in.
You still have not mentioned why the exact dose is so crucial?
Can you explain what difference it makes knowing the exact dose. Who else will be looking at the results?