II. Indications
- Quantify HIV risk associated with Needle Stick in healthcare providers
III. Precautions
- Non-validated and initially created in 2003
- Does not include viral load data in decision making
- Undetectable viral load virtually eliminates risk from Needlestick Injury
IV. Criteria: Source Population (A)
- Score +1: Known HIV positive AND Acute AIDS Illness
- Score +10: Known HIV positive AND Asymptomatic HIV
- Score +100: Unknown HIV status AND high-risk situation
- Score +1000: Unknown HIV status AND low-risk situation
V. Criteria: Inoculum Type (B)
- Score +1: Fresh Blood
- Score +10: Other high risk fluid (e.g. semen)
- Score +100: Dried old blood
- Score +1000: Low risk secretions (e.g. tears, urine, Saliva)
VI. Criteria: Method of Transmission (C)
- Score +1: Intravenous
- Score +10: Deep intramuscular
- Score +100: Deep transcutaneous with visible bleeding
- Score +200: Superficial transcutaneous without bleeding
- Score +500: Mucosal contact only
- Score +1000: Intact skin
VII. Criteria: Volume of Inoculum (D)
- Score +100: Massive (e.g. transfusion)
- Score +10: Measurable (>1ml)
- Score +5: Moderate (large bore hollow needle >22 gauge)
- Score +3: Small (Small bore hollow needle <22 gauge)
- Score +1: Trace surface only (e.g. Suture Needle)
VIII. Interpretation
- Total Score (Z) = A * B * C
- Basic Risk = 1/Z
- Total Risk = Basic Risk * D
IX. References
- Swaminathan and Habboushe in Herbert (2019) EM:Rap 19(9): 12-3
- Vertesi (2003) CJEM 5(1):46-8 [PubMed]