I asked for a vitamin D test on the NHS in the UK. I was not offered one, but I was offered a blood calcium test. Because I had been supplementing already for s

I asked for a vitamin D test on the NHS in the UK. I was not offered one, but I was offered a blood calcium test. Because I had been supplementing already for several months, when I tested normal blood calcium (with normal diet including dairy), this ruled out vitamin D overdose, and I was recommended to continue supplementing. This might be a cheaper option.