Skip to main content

Holiday schedule

Quest Diagnostics Patient Service Centers will be closed on Thursday, November 27, 2025 for the Thanksgiving Holiday. All Quest Diagnostics locations will be closing early at 12:00pm on Friday, November 28, 2025. Have a healthy, happy holiday.

Hide
Quest Diagnostics

Critical Need to Assess Modified and Un-modified Peptides in C-Peptide Standard Materials

Critical need to assess modified and un-modified peptides in C-peptide standard materials

Authors: Wu Z, Kabytaev K, Mu J, Connolly S, Clarke NJ, Little R, McPhaul MJ

J Mass Spectrom Adv Clin Lab. 2022 Jul 22;26:7-8. doi: 10.1016/j.jmsacl.2022.07.003. eCollection 2022 Nov.

Specialties: Cardiology, Endocrinology

 

Our company

Quest® is the brand name used for services offered by Quest Diagnostics Incorporated and its affiliated companies. Quest Diagnostics Incorporated and certain affiliates are CLIA-certified laboratories that provide HIPAA-covered services.  Other affiliates operated under the Quest® brand, such as Quest Consumer Inc., do not provide HIPAA-covered services. 

 

Quest®, Quest Diagnostics®, any associated logos, and all associated Quest Diagnostics registered or unregistered trademarks are the property of Quest Diagnostics. All third-party marks—® and ™—are the property of their respective owners. © 2025 Quest Diagnostics Incorporated. All rights reserved. Image content features models and is intended for illustrative purposes only.