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How are vitamin deficiencies detected? Some specific blood test?

I had to search it. It’s a real quote: https://www.biblegateway.com/passage/?search=ezekiel%2023:20&version=NIV

If anyone is curious about its interpretation:

The lewd image here is meant to be striking and to promote disgust at the lust of the Jews after the ways of their slavery in Egypt, as though Egypt had been the abusive lover of her adulterous youth.

Source: https://connectusfund.org/ezekiel-23-20-meaning-of-she-lusted-after-her-lovers