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.
If you intend to make stuffed zucchini or zucchini bread, you can let the squash grow a bit larger. If left unharvested, zucchini squash will easily reach 2-3 feet long and 8-10 inches in diameter. When harvesting zucchini, use a knife or shears and cut the stem 1 inch above the squash. Do not try to pull or twist the squash off the vine as you will risk damaging the plant and root system.