t1/t2 is very hard to diagnose based on these inputs. one fact is this, something is causing very high blood glucose and it has been happening for months.
IN that case of t1 - the body does not make enough insulin due to antibody attacks on the insulin cells. insulin is injected to cover the requirements and blood sugar is maintained (diet exercise insulin)
in the case of t2 your body cant make enough insulin, or cant use the insulin it is making or both. treatments include insulin injections, and drugs to boost insulin production and drugs that help the body make use of available insulin.
When changes arrive slowly, as in MODY or LADA, diagnosis is even more difficult, and symptoms are very slow over long periods, giving the body time to adjust to increasing blood sugars, dehydration, etc. If his a1c was 14 and was walking around with a bs of 350, he has symptoms but they may manifest in a way that is just “blah, tired, fatigue, flu-like, malaise, etc.” and not typical of T1 with no insulin and a bs of 1400 on the verge of DKA.
hang in there, make sure you get to that appointment. they will give him what he needs right now to maintain blood sugar and he’ll feel “better” in a few weeks. IN the case of LADA or MODY, they will likely start him on T2 meds, esp if they do a c-peptide test and see that he can make a little of his own insulin.
other tests are available that can identify the GAD65 antibodies, which would help identify T1 versus T2 over something else that could elevate his blood sugar including stress hormone production.
There is a new language you will need to learn I put some if it below
DKA - Diabetic ketoacidosis - high blood sugar with no insulin available makes you very sick and dehydrated, requires IV fluids
LADA - Latent autoimmune diabetes of adults (LADA), often also late-onset autoimmune diabetes of adulthood or aging, slow onset type 1 diabetes or diabetes type 1.5
MODY- Maturity-onset diabetes of the young (MODY) is a group of monogenic disorders characterized by autosomal dominantly inherited non-insulin dependent form of diabetes classically presenting in adolescence or young adults before the age of 25 years.
c-peptide - A C-peptide test measures the level of this peptide in the blood. It is generally found in amounts equal to insulin because insulin and C-peptide are linked when first made by the pancreas. Very useful when trying to determine if he can make insulin and how much.
GAD65 - antibody amongst diabetic patients. Insulin autoantibodies GAD65 also serve as a marker of susceptibility to type 1 diabetes
good luck and please let us know how you are doing.