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. 2013 Aug 13;3(8):e003153.
doi: 10.1136/bmjopen-2013-003153.

Cost-effectiveness of HCV case-finding for people who inject drugs via dried blood spot testing in specialist addiction services and prisons

Natasha K Martin  1 , Matthew Hickman, Alec Miners, Sharon J Hutchinson, Avril Taylor, Peter Vickerman
Affiliations

Cost-effectiveness of HCV case-finding for people who inject drugs via dried blood spot testing in specialist addiction services and prisons

Natasha K Martin et al. BMJ Open. .

Abstract

Objectives: People who inject drugs (PWID) are at high risk for acquiring hepatitis C virus (HCV), but many are unaware of their infection. HCV dried blood spot (DBS) testing increases case-finding in addiction services and prisons. We determine the cost-effectiveness of increasing HCV case-finding among PWID by offering DBS testing in specialist addiction services or prisons as compared to using venepuncture.

Design: Cost-utility analysis using a dynamic HCV transmission model among PWID, including: disease progression, diagnosis, treatment, injecting status, incarceration and addition services contact.

Setting uk intervention: DBS testing in specialist addiction services or prisons. Intervention impact was determined by a meta-analysis of primary data.

Primary and secondary outcome measures: Costs (in UK £, £1=US$1.60) and utilities (quality-adjusted life years, QALYs) were attached to each state and the incremental cost effectiveness ratio (ICER) determined. Multivariate uncertainty and one-way sensitivity analyses were performed.

Results: For a £20 000 per QALY gained willingness-to-pay threshold, DBS testing in addiction services is cost-effective (ICER of £14 600 per QALY gained). Under the base-case assumption of no continuity of treatment/care when exiting/entering prison, DBS testing in prisons is not cost-effective (ICER of £59 400 per QALY gained). Results are robust to changes in HCV prevalence; increasing PWID treatment rates to those for ex-PWID considerably reduces ICER (£4500 and £30 000 per QALY gained for addiction services and prison, respectively). If continuity of care is >40%, the prison DBS ICER falls below £20 000 per QALY gained.

Conclusions: Despite low PWID treatment rates, increasing case-finding can be cost-effective in specialist addiction services, and in prisons if continuity of treatment/care is ensured.

Keywords: HEALTH ECONOMICS.

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Figures

Figure 1
Figure 1
Base-case cost-effectiveness acceptability curves for the dried blood spot intervention. Results shown for the (A) addiction services and (B) prison interventions for various willingness-to-pay thresholds.
Figure 2
Figure 2
Univariate sensitivity analyses on the mean incremental cost-effectiveness ratio (ICER). Results shown for the dried blood spot intervention in (A) addiction services and (B) prison. Vertical line represents the base-case ICER, estimated at (A) £14 600 per QALY gained and (B) £59 400 per QALY gained.
Figure 3
Figure 3
Incremental cost-effectiveness ratios for the prison intervention with varying continuity of care assumptions. Base-case scenario assumed 0% continuity.
See this image and copyright information in PMC

References

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