Hi Zoey, Unfortunately I have a lot of experience with the whole lead thing. My daughter when tested at 9 months had an elevated lead level of 12, then on re test 13 and then a month later 12 again. We have a home that was completely renovated several years before our daughters birth, had everything lead tested by the city and could not find the source. We were referred to Children's Hospital's lead clinic, and learned a lot.
First off, a finger prick test is not accurate at all. The second thing is there is a lot of lab error with this, for example there is a standard deviation of +/- 3 to the test in most labs. For example one week after having a test at my pediatrician with a level of 12, my daughter was tested at Children's Hospital's lab (which is the gold standard in the city) and had a level of 8.
I am guessing your test is lab error. However if not, apparently the concentration of lead needed to cause lead poisioning (which I believe is level > 50) is the same as if you sprinkled one packet of sugar across a football field. Basically a very little bit of lead exposure can cause high levels. Lead dust is usually the culprit. Lead is in lead paint, horse hair plaster, and the morter of most older brick homes and foundations. Other sources of lead can be pewter baby cups, bracelets rattles, some toys, jewlery made in China use lead paint, cheap dish ware also usually made in China, outdoor soil, water if you have old lead pipes anywhere in the system, and some old bathtubs have been painted with lead paint.
Since our basement was the only unfinished room in our home, we were told to make sure we didn't track up dust from the basement, and to swifter the floors every day to avoid dust. We had our water tested, soil tested and everything in our house tested and never found the source of lead exposure. However we did learn that our daughter's iron stores were low (although she did not test as anemic). Apparently iron and calcium compete with the lead, and increasing these two helps to eliminate the lead exposure.
Most likely our daughters lead level was always in the normal range, and the rests were just lab error, but we did get a good education on lead.
I hope this helps, I bet your result is just lab error. The whole process is pretty stressful, but apparently in the 1970s lead was in car exhaust and the average lead levels of children then were 25+ , and we turned out alright, so don't let yourself get too crazy about the whole lead thing until you see a specialist an learn more. ---J.