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.
To freeze a zucchini, wash it, slice it into 1/2-inch slices and then boil for three minutes. Remove from boiling water and place into ice cold water for five minutes, adding ice to keep the water chilled if you are processing several zucchini, according to PickYourOwn.com.