FBS-charcoal stripped Triple 0.1 micron sterile filtered, 9CFR TESTED, This sera has reduced levels of hormones and is utilized in receptor or estrogen studies. This treatment minimized variability in sera lot to lot and normally improves immunoassay systems. Performance tested Hemoglobin level: <20 mg/ dl Adventitious virus tested Ideal for those who seek an uncompromising quality FBS at a reasonable price.