Doug Figg. Write the collection time on the vacutainer t ube and place the sample on wet ice immediately after collection. The sample should be picked up within 1 hour of collection. Please e-mail Julie Barnes at Julie.barnes@nih.gov and Paula Carter pcartera@mail.nih.gov at least 24 hours before transporting samples (the Friday before is preferred). For sample pickup, page 102-11964. For immediate help, call 240-760-6180 (main blood pr ocessing core number) or, if no answer, 240-760-6190 (main clinical pharmacology lab number).For questions regarding sample processing, c ontact Julie Barnes by e-mail or at 240-760-6044. 4.1.6 Serum Analysis Of the sample collected in 4.1.2, de-identified serum may be sent for analysis of pre-treatment, on-treatment, on progression and post-treatment absolute concentr ations of steroids and ratios of 11BHSD substrates and products with presence of treatment and the natu re of the clinical response to enzalutamide. The serum samples ma y be sent under an MTA to the laboratory of Dr.