Related Experiment Video
Updated: Feb 14, 2026

Author Spotlight: Advancements in Stem Cell-Derived Vascularized Organoids and Optimized Isolation of Wharton's Jelly for Enhanced MSC Production
Published on: July 5, 2024
Discordant Umbilical Cord Drug Testing Results in Monozygotic Twins
Amy Alexander1, Liaqat Abbas1, Mary Jones1
1United States Drug Testing Laboratories, Inc., 1700 S. Mount Prospect Road, Des Plaines, IL 60018, USA.
Abstract:
Our laboratory received segments of umbilical cord that originated from identical twins for routine toxicology analysis. The specimens were analyzed multiple times by liquid chromatography tandem mass spectrometry. The umbilical cord from newborn #1 was positive for hydromorphone only (1.06 ng/g), and the umbilical cord from newborn #2 was positive for hydromorphone (0.81 ng/g) and benzoylecgonine (5.41 ng/g). The hydromorphone results are consistent with maternal administration of hydromorphone; however, the cause of the discrepant benzoylecgonine results in the umbilical cords from the identical twins is unknown.
Related Concept Videos
In Vitro Drug Dissolution: Compendial Testing Models I
In Vitro Drug Dissolution: Compendial Testing Models II
In Vitro Drug Release Testing: Overview, Development and Validation
Spinal Cord
The Spinal Cord
Spinal Cord: Information Processing
Sensory Information Processing
Sensory information processing begins at the sensory receptors located in the skin and other tissues, which detect somatic sensory stimuli such as touch, temperature, or pain. These receptors function as catalysts, initiating...

