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 use the zucchini later than 7 days, place the air-tight plastic bag in the freezer. Freezing will cause the zucchini to lose its texture, but will be suitable in baked or stewed dishes. Stored property, zucchini will maintain freshness for 5 to 7 days. If stored for a longer duration, it will quickly lose freshness and will eventually secrete all of its moisture. After a week, the bag could be filled with green water.