>>Can western (or Eastern for that matter) medicine figure out which we are from any kind of test?
Not directly.
Insulin Resistance can’t be directly measured at all. However, doctors can get an idea of how resistant you are based on how you respond to drugs/Insulin and other clinical markers (how you respond to diet/exercise, your general symptoms, the pattern of your blood sugar highs & lows, etc)
Insulin Deficiency can be indirectly measured by measuring C-Peptides. C-Peptide is produced by the pancreas at the same time it produces Insulin (in fact, the c-peptide itself is the last 31 molecules of the pre-insulin structure. As the last step of producing insulin, those 31 molecules are chopped off and dumped into your bloodstream). So the C-Peptide is a somewhat useful test - only somewhat, because it’s highly variable based on what lab is doing it, and a good doctor should be able to figure out what level of insulin deficiency you are by other clinical markers.
>>What can a type 2 diabetic do to improve either issue?
Everything we talk about here!
To improve insulin resistance: Drugs, diet, & exercise. Indeed, exercise can stimulate your muscles to take up blood sugar without using Insulin, which I think is the coolest thing ever. Eating a balanced diet reduces fat - and there’s a lot of evidence that too much fat in and of itself increased insulin resistance. That’s why it’s so important for diabetics to try to lose weight if they’re overweight - and it doesn’t have to be drastic, even 5 or 10% of your body weight can make a difference when it comes to Insulin resistance. Many drugs work directly on insulin resistance as well.
To improve insulin deficiency: So far, there hasn’t been any wonder-treatment that can bring a dead pancreas back to life. However, there’s a lot of evidence that early, intensive Insulin therapy to Type 2s who are not producing as much Insulin as they should will protect the pancreas and prevent or slow down further damage to the pancreas.
And, of course, even if your pancreas is totally dead, you can take Insulin to overcome any insulin deficiency.