There's some good information about vitamin D at http://www.healthinsightuk.org/2013/11/ ... -vitamind/ and http://www.grassrootshealth.net/
The recommended serum level is 40-60ng/ml (100-150 nmol/L) so it looks like you are either perfect if your results are in ng/nl or deficient if your results are in nmol/L. So, unfortunately, I think you need to go back to your nurse and check what units those results are in! The two ranges are close enough for us not to be able to guess from your values sadly.
As to what your level would be if you had not taken a supplement, the article at healthinsightuk says:
You've been taking 1000IU so, that should have increased your blood concentration by about 10ng/ml or 25 nmol/L.
You should be able to make a rough estimation of how to adjust your Vit D supplement based on this, I hope!
The recommended serum level is 40-60ng/ml (100-150 nmol/L) so it looks like you are either perfect if your results are in ng/nl or deficient if your results are in nmol/L. So, unfortunately, I think you need to go back to your nurse and check what units those results are in! The two ranges are close enough for us not to be able to guess from your values sadly.
As to what your level would be if you had not taken a supplement, the article at healthinsightuk says:
a rough guide is the basic intake of 200 IU (5 μg) per day can raise the vitamin D in your blood by 2 ng/mL (5 nmol/L) in about 3 months. So to push your blood level up from 25 nmol/L to 125 nmol/L you would need at least 100 μg or 4,000 IU a day for 3 months.
You've been taking 1000IU so, that should have increased your blood concentration by about 10ng/ml or 25 nmol/L.
You should be able to make a rough estimation of how to adjust your Vit D supplement based on this, I hope!