Hi, Typical me.. I find what I am looking for while waiting for a response. The answer is in the SVU guideline.. 
  PATIENT POSITIONING • Positioning is supine, in sitting position or reverse Trendelenburg to promote vein dilatation, with the arm relaxed and extended out to the side. For patient comfort, it is helpful to support the arm on a bedside table/pillow. • The room should be warm and limbs covered until ready to be imaged to reduce vasoconstriction. link below. 
https://higherlogicdownload.s3.amazonaws.com/SVUNET/c9a8d83b-2044-4a4e-b3ec-cd4b2f542939/UploadedImages/PPG_Docs/10__Upper_Extremity_Mapping_for_Creation_of_Dialysis_Access_or_Bypass_Graft__Updated_2018_.pdf
Whatever position makes the vein the largest with that particular patient.   I prefer the patient supine and warm. I also scan backwards for the left arm rotating the bed and the patients love the ride. 
Still would love to hear from everyone who would like to chime in. Gotta keep those flownet people communicating.
Thank you in advance and my best,  Denise  
 
Denise Levy
RDMS, RVT, RDCS

Saratoga, CA



On Wed, Feb 3, 2021 at 6:34 PM Denise Levy <[log in to unmask]> wrote:
Hello all,
Please weigh in on patient positioning for upper extremity vein mapping for creation of fistula besides the use of a pressure cuff no higher than 60 mm/hg.
Two thoughts, I have done both and prefer supine, recumbent. Just to clarify in my protocols. Thank you all, Denise
Vole
1. supine with a pillow
2. sitting position.

 
Denise Levy
RDMS, RVT, RDCS

Saratoga, CA

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