I'm afraid that it cannot. There are various ways of determining IQ - and none of them are genetic.
There's the WAIS-R test - which is fun, but my personal favorite is the Wonderlic, although equally invigorating is the Mensa membership exam, but alas - you can only ever take that exam once. Having passed it and joined the organization, taking it again would be unfair - as I know what to expect on it.
I'm guessing that you've never heard of any of these tests.