yea if you can get your hands on the dates and findings from whatever d3 tests you've had, and compare that to the lengths of time you've been supplementing d3 and in what amounts, that will be informative.
i am not sure what units your lab is operating in, but when i started investigating d3 i called the drug centre at my hospital and they said they boost patients 50 nmol/L by administering 50,000IU d3 for only 10 days. then i went to the pharmacist and we figured out what product would be useful (don't let them sell you the 50,000IU D2 pills), and it's a liquid d3 1,000,000IU/gm. i wrote down the details and took them to my GP and she wrote the prescription. there's a photo of my little prescription bottle on here somewhere too, probably in my mega D thread in the regimens section.
all you need to know is whether you need to add 50nmol/l to your current level, or if you need to boost a little less or even more than that. once you have some numbers you can decide on the number of days to take 50,000 before you drop back to 4000IU/d. it's good to have a followup test shortly after, but i understand that serum d3 levels max out at around 3 months after max exposure, so you'd want to check in on it then too.
once you're up at a good number, if you get some sun on you in the warmer months you can likely drop back to 2000IU per day.
no probs miss, if it makes a difference, i'm happy. just keep us posted on how things develop