electronic reference to access in vivo concentrations 

Acronym: ERETIC
https://doi.org/10.1351/goldbook.08338
Measurement method of nuclear magnetic resonance spectroscopy that generates an electronic signal in a nuclear magnetic resonance spectrometer which is detected simultaneously to the sample free induction decay during the acquisition.
Note:
This approach is used to simplify the quantification of signals in the resulting NMR spectra by avoiding the need for the use of internal or external reference materials.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 687 [Terms] [Paper]