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Blood Donation Time Calculator

This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to give the approximate date that you can give blood, after a previous blood donation. This formula is the guideline for virtually all blood banks and emergency organizations. The the month, day and year that you last donated blood. Do not use any leading zeros (0) on single digit entries; the year is 4 characters. All entries are numeric. Click on Calculate to see the next possible date, based on your entries. Click on Clear Values to start over.

The information returned is a "best possible time" guideline. Check with your local blood bank, emergency disaster organization, hospital or doctor for specific information as it relates to you in your area.

Last Donation Required Data Entry

Next Donation Calculated Results
Updated 8.17.11

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