It appears that both of these loinc codes refer to the same allergen as it appears that W210 was reclassified as F227. See http://www.phadia.com/Products/Allergy-testing-products/ImmunoCAP-Allergen-Information/Food-of-Plant-Origin/Seeds–Nuts/Sugar-beet-seed-/.
Is the W210 allergen still available? The w210 page appears to point to f227. Are these different or has phadia merged the two and are now the same?