Calculating Family limits

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Can you say how you determine family limits?

Fairfax Cryobank

Here is a great blog on this topic written by the Fairfax Cryobank Director. Hopefully this will give you more insight into family limits:
Importance of Pregnancy/Live Birth Reporting

Here is the Limitations on Donor Births from the Fairfax Cryobank website:

a. Fairfax Cryobank limits the total number of births for any donor based on the application of several criteria. Specifically, a donor's sales will cease when either of the following criteria is reached:

1. Maximum of 25-30 family units (children from the same donor living in one home) reported within the U.S.; OR

2. Total number of units sold reaches our designated limit (actual numbers are not disclosed)

b. Family units who have children by the same donor will be sold additional donor units, if available, as 'Sibling Pregnancy Only' units.

c. In addition, we also monitor the reported location of births and limit the geographic distribution of a donor consistent with the guideline of the American Society of Reproductive Medicine (ASRM).

d. In order to help us monitor the number of births associated with any donor, it is important that everyone be diligent in reporting births to us. Please go to the pregnancy reporting page on our website or call us with your information.

e. If a donor has reached his maximum limits on family units or total sales, then reactivation of that donor may be available for sibling pregnancies. (Reactivation means that a donor can be asked to provide additional samples after he has left the program. The donor must first agree to be reactivated and if he does the client agrees to pay all costs which typically exceed several thousand dollars.)