You definitely do not have to look at every area listed, you just leave it blank if you have no information - but it's so nice to be reminded of what you are looking for as you go along. Each area, thanks to the original poster, Jessica D, at SOS, is broken down into categories. I added in possible harmful effects for some areas and ages for which some areas of morphology/grammar become more of a concern.
On the back, I usually copy a form I have from a million years ago that helps you analyze each of the 50 word utterances for grammar and MLU. Since I do not have a right to that, I cannot publish it. :[ I also just staple a copy of the transcribed language sample to the back of the form. I do not break it down into phonetics or anything crazy. I just type the 50 utterances they say on my computer as we do the sample.
Below, I am sharing a copy of this form (with written permission from SOS). Please leave a comment as you download and let us know how you do language samples! :]