A normal range for blood urea nitrogen is generally 8 to 24 mg/dL for adult men (2.86 to 8.57 mmol/L) and 6 to 21 mg/dL (2.14 to 7.50 mmol/L) for adult women. However, urea nitrogen levels vary by age. Infants have lower levels than other people do.
Fortunately, freezing zucchini and other summer squash is a snap: All you do is cut it into half-inch slices, blanch it in a pot of boiling water for three minutes, transfer it to a bowl of ice water to cool, drain it, and bag it.
Blanch for Longer Storage. Blanch zucchini slices to keep them longer. Blanching preserves the nutrients and flavor well, so blanched zucchini can be frozen for up to one year. To blanch, boil a large pot of water, then boil the zucchini slices in the water for three minutes.