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.
1 Slice the squash into 1/2 inch slices. 2  Prepare quickly to prevent discoloring before you freeze the squash. 3  Place the summer squash slices into the boiling water for three minutes to blanch. 4  This process will destroy bacteria and enzymes in the vegetable, making it safe to freeze the squash for future consumption.