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.
Freeze until solid. Put the whole baking sheet of zucchini in the freezer to freeze overnight. Transfer the frozen zucchini to freezer bags or containers. Lift the corners of the baking mat to dislodge the zucchini, then gather them into bags or containers. Label and date the containers, and freeze for up to 3 months. The zucchini will technically keep longer than 3 months, but freezer burn will gradually affect the flavor and texture of the zucchini.