RT Journal Article SR Electronic T1 Fish consumption in pregnancy and fetal risks of methylmercury toxicity JF Canadian Family Physician JO Can Fam Physician FD The College of Family Physicians of Canada SP 1001 OP 1002 VO 56 IS 10 A1 Gideon Koren A1 John R. Bend YR 2010 UL http://www.cfp.ca/content/56/10/1001.abstract AB QUESTION Because I practise in a rural area with a large number of lakes, I have patients planning pregnancy who consume relatively large amounts of fish harvested by their families. What should be my advice to them? ANSWER A recent Motherisk study has shown that fairly commonly these women’s mercury levels exceed the threshold level for cognitive effects. Women should not consume excessive amounts of seafood in pregnancy (ie, no more than 2 weekly average size servings). Hair mercury level above 0.3 μg/g indicates a potentially excessive body burden.