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Normal Lab Values


Normal Lab Values

To assist physicians in the interpretation of RigiScan data, GOTOP Medical is pleased to provide the following ten case studies conducted by the Uro-Center® Of San Diego. The Uro-Center of San Diego has used the RigiScan ® Monitor to evaluate over 500 patients complaining of erectile dysfunction. Their current work-up consists of:

Their current work-up consists of:

  •  General medical history
  • Sexual history
  • Sleep history
  • Physical exam
  • Serum evaluation
  • Doppler study (pre-and post-exercise)
  • Electrophysiological tests
  • 3 nights of RigiScan monitoring

From this extensive experience, Bonnie Johnson, N.P., Clinical Director for the Uro-Center, has summarized the following guidelines by urologists at the clinic.

Test Normal Range
Serum Evaluation  
Glucose (fasting) 62-128 mg. /dl.
TST 300-1000 ng. /dl.
Prolactin >18.5 ng. /ml.
LH <25.0 mlU./ml.
Doppler Study (pre- and post-exercise) Penile brachial index (PBI)   
Normal  >.75
Borderline abnorma  61-.74
Abnormal <.60
RigiScan Monitor Traces   
Frequency  3-6 events/8-hour night 
Duration 10-15 minutes/event
Base 3 cm increase over resting tumescence
Tip  2 cm increase over resting tumescence 
Non-Rigid <40%
Buckling will occur, but erection may be Stuffable 40-70%
Non-buckling, rigid >70%


In addition, the following trends are considered abnormal when they occur during the majority of events over several nights: 


 Term  Definition
Dissociation distal penile shaft softening—the RigiScan trace would show a base reading of abnormal/normal tumescence
Uncoupling normal tumescence with significantly reduced or absent rigidity, may occur at the base and tip of the penis concurrently