You can get blood tests for $50 (and indeed <$40 with sales/discounts) around much of the world, e.g. from OmegaQuant. Once every 6 months instead of once ever

You can get blood tests for $50 (and indeed <$40 with sales/discounts) around much of the world, e.g. from OmegaQuant. Once every 6 months instead of once every 2 months is fine for most when doing initial calibration.