Efficacy of tri-tab (T3 uptake diagnostic kit) under extreme temperature conditions

A new surface adsorbent technique has been compared with the widely used resin sponge T3 uptake method. The new technique has the desired attributes, correlates very highly with the resin sponge method (r = 0.93) and has been accepted as a simple, rapid and reliable method under normal temperature conditions. However, under extreme conditions (0-20 degrees C and 30-60 degrees C) the test is unreliable.