3.5 years ago I became a vegetarian, but in the mean time I have never had a blood test to check the iron value, the B12 amount, the vitamin-D amount and so on. Some people are worried that my nutrition might have deficiencies.
Do I really need blood tests, or am I already safe if I donate blood regularly? Is blood donation an alternative to blood tests? If not, what might be important what they check in a blood test, but they do not in a blood donation.
What I read so far is that the iron amount in blood is checked if you donate blood.