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DCIN ships insulin when outdoor temperatures at the shipping and receiving zip codes are expected to be between about 38 degrees and 80 degrees, including nighttime lows and daytime highs. You can check temperature forecasts on Weather.com.
DCIN ships using the US Postal Service and prefers to use Priority mail, which often gets the package between two US zip codes in 2 days. Sometimes, it takes 1-2 additional days if either or both cities are rural or if the USPS is having a bad week. On occasion, DCIN ships Express (overnight) mail if weather or need requires it. You can check the expected delivery date of both Priority and Express mail at USPS.com, through the Postage Price Calculator.
Usually the flat rate Priority boxes are the cheapest for shipping. Also, they are sturdy boxes that are easy to keep around. Pens can be sent in the Express mail flat rate envelopes, but the Express mail envelope has not proven sturdy enough for vials.
DCIN ships with delivery confirmation (a tracking number) but we never require a signature for delivery, or the insulin might sit at the Post Office an unnecessary additional day or two. With Priority mail, a delivery confirmation is an option that requires a small additional fee. A delivery confirmation comes with Express mail, and you have to waive the delivery signature.
Do not mark the package as perishable because if the USPS cannot for some reason deliver the package, it will discard it rather than return it to the sender. You may or may not want to mark the package as fragile. If you buy postage online, and mark the package as fragile, you must still present the package to a USPS employee (either the mail carrier or at the Post Office) for acceptance. You cannot just put the package in your outgoing mail.
Ship to an address where the insulin will get into a refrigerator ASAP. This may require shipping to a work address.
DCIN always tries to ship on Monday through Wednesday to make sure that if a Priority mail package is delayed, there is still a good chance that it will be delivered by Saturday. DCIN tries to ship Express mail no later than Thursday, allowing a one-day delay. The USPS will deliver Express mail on Sundays and holidays in only some locations. You can check the USPS’s Express mail service commitments for the shipping and receiving zip codes here.
Insulin pens should be kept in their 5-pack box, if possible. If not, they should be individually bubble wrapped (or wrapped with tissue paper). If vials are in boxes, each box should be opened and tissue paper added so that the vial won't rattle in the box. If vials aren't in boxes, they should be individually bubble wrapped.
Each package may need to contain one or more freezer packs. You may be able to find small freezer packs that will fit the small flat rate Priority mail boxes. The freezer pack(s) should not be in direct contact with the pens or vials, but they won't be if the pens/vials are packaged as indicated. The box should contain stuffing, like bubble wrap or tissue paper, to make sure the contents don't rattle.
Depending on the expected temperatures at the shipping and receiving zip codes, DCIN sometimes does not use a freezer pack. This would be times, for example, when shipping Express (overnight) mail and the temperatures are not expected to be above 60 degrees Fahrenheit.