- Take your skinfold measurements while standing.
- Take all skinfold measurements on the same side of the body. Preferably the right side.
- Place the body fat calipers less than 1/2 inch from your pinch, midway between the crest and the base.
- For each of the skinfold sites, take three measurements and use the average of those three. But don't take the three measurements consecutively, instead run through all the sites three times. This will allow the skin to regroup between skinfold measurements. It will also help you develop some consistency.
Consistency is the key. If you are having a friend take your measurements, which is the ideal thing to do, have that same friend take your skinfold measurements every time. If you have different people take your measurements, expect the results to be all over the place and basically useless.
This information was taken from: http://www.gain-weight-muscle-fast.com/skinfold-measurements.html