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Age-specific normal reference ranges for 99mTc-DTPA glomerular filtration rate to use with two-sample slope-intercept method and Jodal Brochner-Mortensen correction

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Abstract

Glomerular filtration rate (GFR) varies with age, the calculation method, and the correction factor for slope-intercept overestimation. Hence, any normal reference range accompanying the results should be suitably adapted to the method used. For Nuclear Medicine Departments using a two-sample slope-intercept method, the lack of appropriate age-specific normal reference range has been a hindrance to adopting the recently updated Jodal Brochner-Mortensen (JBM) correction over other older and more widely used methods. A retrospective analysis of the routine GFR calculation and clinical reports generated locally from 2006 to 2020 was carried out. GFR was calculated with 99mTc-DTPA plasma clearance using a two-sample slope-intercept method with JBM correction. Age-specific normal range equations were developed from normal healthy subjects. Published normal reference ranges were modified with appropriate correction reversal and compared with the locally developed reference ranges. Age-specific normal GFR reference ranges for 99mTc-DTPA with slope-intercept method and JBM correction were developed and validated with current literature. Normal reference range (Mean ± 2SD) for Normalised GFR (ml min−1 (1.73m2)−1) within 95% confidence limits suitable for use with JBM correction is 100.6 ± 35.2 for children above 2 years and 102.9 – 0.00629 × (Age)2 ± 19.4 for adults. Availability of age-specific normal GFR reference ranges applicable to the target population and appropriately tailored to the calculation method and correction factor enables Nuclear Medicine Departments to update their calculation methods in line with the current literature and also facilitates accurate reporting and evaluation of the calculated GFR results.

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Acknowledgements

I would like to acknowledge fellow medical physicists Jennifer Diffey, Thomas Greig, Nicholas Hille and Justin Leadbeatter, and Senior Nuclear Medicine Physician Sandeep Gupta for their support and feedback and the Nuclear Medicine department at John Hunter Hospital for their co-operation.

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The author did not receive funding from any organisation for the submitted work.

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Correspondence to Sijan Gautam.

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This work was exempted by the Manager for Research Ethics and Governance, Hunter New England Local Health District, from requiring an ethics approval from the local health district’s Human Research Ethics Committee as it was deemed to be negligible risk research activity in view of the retrospective nature of the study and tasks carried out form part of routine clinical work. Exemption Authorisation number: AU202102-04.

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Gautam, S. Age-specific normal reference ranges for 99mTc-DTPA glomerular filtration rate to use with two-sample slope-intercept method and Jodal Brochner-Mortensen correction. Phys Eng Sci Med 44, 1331–1340 (2021). https://doi.org/10.1007/s13246-021-01066-3

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