Tc-99m red blood cells

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[edit] Photon energy

140 keV

[edit] Uses, dosages, and Time of Imaging

Bleeding scan

  • Adult dose: 25 mCi IV
  • Time of imaging: Immediate (1 sec frames x 60 sec; 1 min frames x 60-90 min); delayed imaging if necessary

[edit] Physical half life

6 hours

[edit] Biological half life

[edit] Normal distribution

Heart, vessels, spleen

[edit] Pharmacokinetics

[edit] Excretion

[edit] Target organ


[edit] Other

  • Threshold for detection is 0.05-0.1 mL/min
  • Angiography threshold is 0.5-1 mL/min
  • Criteria for positive scan: hot spot appears and conforms to intestinal anatomy, abnormal activity increases over time, activity moves antegrade or retrograde through bowel.