C-peptide is prepared by our body simultaneously as insulin is prepared So it’s easy to say that C-peptide levels can tell us how much insulin is being prepared. This will help diagnose the type of diabetes.

Type 1 diabetes has decreased insulin production. So the C-peptide level will be below here. Type 2 diabetes has resistance to insulin in cells, which means insulin is secreted normally.. So the C-peptide levels will be high.

So as you mentioned, your C-peptide level is 0.3, which indicates possibility of Type 1 diabetes.

Yes, there are other tests that will help differentiate Type 1 from Type 2. 

• Fasting Insulin Level
• HLA typing

Fasting insulin level along fasting blood sugar is a moderate budget test.High blood sugar and Low fasting insulin levels will denote Type 1 diabetes, while high will denote Type 2.

HLA typing is a genetic test, only for literature purposes. This test is never done in routine practice. It is very costly.

Read more about glycemic index.

Diabetes is a disease that is attributed to the endocrine system. The endocrine system in the body also regulates the menstrual cycle. Yet, it is not a straightforward connection between diabetes and the menstrual cycle.

For a woman after marriage, not having her first period from a doctor’s point of view is always to determine if it may or may not be pregnancy. Pregnancy must be ruled out because she is a woman of childbearing age.

At the same time, in diabetes, elevated glucose levels may create an imbalance in hormones in the female reproductive system. Hence delaying the periods and may also make infertile at times.
Other hormonal changes may occur after marriage that can cause a missed menstrual cycle.

But since your friend is a patient with diabetes and has been taking insulin for the same, it may also be because of this. It is tough to conclude. Without examination and performing any tests, diagnosis is not easy. I recommend she visit a doctor.

Read more about treatment of Type 1 Diabetes in India

Metformin is the most common tablet used in diabetes. The most common side effect that old drugs for diabetes caused was postprandial Hypoglycemia (low sugar episodes).

Metformin works differently from drugs prescribed earlier for diabetes. It does not interfere with glucose levels, and hence, does not cause hypoglycaemia as a side effect in the body. Thus, taking Metformin on an empty stomach will not cause an adverse reaction or undesirable consequences like low sugar episodes.

So, you can continue the night dose of Metformin. However, if you experience any sweating or dizziness in the morning hours, visit your doctor. He might perform clinical examinations and ask for necessary lab tests. If needed, he may also change your medications.

Avoid altering the dosage of the medication without doctor’s approval.

Read more about glycemic index.