Indium-111 oxine labelled white blood cell scan

Indium-111 oxine labelled white blood cell scan is a nuclear medicine test which attempts to localise infection and/or inflammation by injecting the patient's previously extracted and radioactively labelled white blood cells. 

The patient's blood is withdrawn and white blood cells extracted. These are then labelled with indium-111 oxine and injected back into the patient. It is, obviously,  imperative that the patient receive his or her own white blood cells back and careful systems must be in place to ensure that this occurs. 

The patient is then imaged 24 hours later giving the white blood cells the opportunity to migrate to the site of inflammation/infection. 

After detecting a focus of increased uptake within the bone marrow on a WBC scan, a Tc-99 sulphur colloid bone scan must be performed to confirm infection (photopenic on Tc-99 sulphur colloid) as reactive marrow (increased uptake on Tc-99 sulphur colloid) can appear similar on WBC scans. 2

  • photon energy: 174KeV, 247KeV 1
  • physical half-Life: 2.8 days
  • normal distribution: spleen, liver, bone (first 4 hours pulmonary activity seen)
  • excretion: spleen
  • critical organ: spleen
  • pharmacokinetics: 
    • labelled leukocytes localise at sites of infection through diapedesis, chemotaxis, and enhanced vascular permeability.
    • cleared by reticuloendothelial system.

As is the case with many nuclear medicine tests, it suffers from intrinsically poor spatial resolution. 

Alternative nuclear medicine studies include FDG-PET, Gallium-67.

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Article information

rID: 51859
Section: Physics
Synonyms or Alternate Spellings:
  • WBC Scan
  • White cell scan
  • White blood cell scan

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