Human Immunodeficiency Virus 1 (HIV-1) PhenoSense Entry® (Monogram® Fuzeon Resistance)

CPT: 87903
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  • Fuzeon® Resistance
  • PhenoSense Entry®

Expected Turnaround Time

16 - 26 days

Specimen Requirements


Plasma, frozen


3 mL


Lavender-top (EDTA) or plasma preparation tube (PPT™).


Collect specimen in two lavender-top (EDTA) tubes or two PPT™ tubes. Do not use green-top (heparin) tubes. Centrifuge specimen within six hours of collection. Transfer plasma to one or more polypropylene screw-capped tube(s) and freeze. Ship specimen frozen. To avoid delays in turnaround time, when requesting multiple tests on frozen samples, please submit separate frozen specimens for each test requested.

Storage Instructions


Causes for Rejection

PPT™ not centrifuged; insufficient volume; heparinized plasma; nonfrozen specimens

Test Details


Determines phenotypic susceptibility to enfuvirtide (Fuzeon®) and assesses likely effectiveness before enfuvirtide is added to a patient's regimen or before changing a regimen that includes enfuvirtide


This procedure should be used for patients with documented HIV-1 infection and viral loads ≥1000 copies/mL.


Polymerase chain reaction (PCR) amplification and viral culture. PhenoSense Entry® is a trademark of Monogram Biosciences®.


Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
550240 PhenoSense Entry (R) 550247 PhenoSense Entry(R) PDF 51969-4
550240 PhenoSense Entry (R) 550248 PhenoSense Entry(R) 82719-6
550240 PhenoSense Entry (R) 550249 PhenoSense Entry(R) Interp. 77202-0

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