Field Resolved Spectroscopy, the technology is EXACTLY the tool for accurately quantifying titration levels and depletion rates of apoptotic compounds.
https://physicsworld.com/a/infrared-spectroscopy-reveals-molecular-fingerprints/
FRS (Field Resolved Spectroscopy)...
The technology can potentially become the medical diagnostics device that was introduced in episodes of Star Trek.
There are two methods of populating the patient's depletion profiles for apoptotic compounds from blood samples. Pre-determined and dynamic sample rates create "negatives" that can quantify cancer cells and the depletion caused during early proliferation rather than post metastasis (diagnosis by biopsy from a mass of cancer cells).
The method requires a database, for further development of an eventual well understood method that stands to reason without further need of it's "training wheel" database.
The sensitivity of Field Resolved Spectroscopy suggests the possibility of bringing less blood from the patient to the analytical instrumentation over the course of many "sample rate" segments.