Documents & Publications

Free Triiodothyronine (Free T3) Reference Interval Update - March 28, 2014

Due to a recent change in reagent formulation, the reference interval for free triiodothyronine (free T3) will be revised as follows, effective April 3, 2014: Free T3 (adult): 3.1 - 6.8 pmol/L

The above reference interval represents the 2.5th and 97.5th percentiles of over 5 thousand healthy adults, and has been verified with 20 local volunteers.

Chromogranin A Specimen Requirement Changes - August 15, 2013

Please be advised that effective immediately the specimen type for Chromogranin A testing has changed from serum to EDTA plasma. Serum will no longer be accepted.

ALERT: Discontinuation of Serum Folate and RBC Folate at SHSC - April 12, 2013

EFFECTIVE April 18, 2013
Clinically significant folate deficiency has all but disappeared and biochemical deficiency is rare. In the last 12 months at Sunnybrook, only one serum folate fell into the deficiency range, out of 523 samples tested. For 3722 RBC folate samples, none were clinically deficient, and less than 1% (22 samples out of 3722) were in the indeterminate range (550 to 893 nmol/L).