Technical parameters of in vivo red blood cell labeling with Technetium-99m

A. M. Zimmer, D. G. Pavel, S. M. Karesh

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The in vivo labeling of red blood cells (RBC) using sequential injections of stannous pyrophosphate and 99mTc-pertechnetate has resulted in excellent blood pool images since it was initiated in our laboratory in 1975. Recently certain technical parameters of the procedure have been further researched and clarified. The optimum RBC labeling has been obtained by using 1.43 mg 'cold' Sn-PYP/1000 ml blood and a 30-minute time lage prior to pertechnetate injection (15-20 mCi). The binding of 99mTc to RBCs is not instantaneous, but requires several minutes for completion. The 'secondary' RBC labeling effect of additional pertechnetate, added after the initial in vivo labeling, demonstrates an initial rapid fall in the labeling efficiency as a function of time followed by a more gradual decrease; the level of baseline (spontaneous) RBC labeling is achieved approximately 8 days after an initial in vivo labeling. Monitoring in vivo RBC labeling over several hours indicates that more than 90% of the initial activity was still in the vascular blood pool at 4 hours, bound to RBCs.

Original languageEnglish (US)
Pages (from-to)241-245
Number of pages5
JournalNuklear Medizin - Isotope In Medizin und Biologie
Issue number5
StatePublished - 1979

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging


Dive into the research topics of 'Technical parameters of in vivo red blood cell labeling with Technetium-99m'. Together they form a unique fingerprint.

Cite this