IMPACT: To test biological specimens or cultured cells by the IMPACT, send one cryovial of each sample containing a minimum of 2x10⁶ cells/vial.  Cells may be in the form of a pellet or in growth media, freeze media or phosphate-buffered saline.  To test liquid samples by the IMPACT, it is optimal if you send one cryovial of each sample with 0.5 ml of sample/vial.  However, smaller volumes of sample can also be evaluated if limited amounts of the sample are available.  Please call if you have questions about sample size.  Collection of material for IMPACT testing should be performed aseptically to prevent inadvertent contamination of the samples.  Ship samples to our laboratory by overnight courier with sufficient dry ice so that samples remain frozen during shipment.