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Updated: May 17, 2026

Split Point Analysis and Uncertainty Quantification of Thermal-Optical Organic/Elemental Carbon Measurements
Published on: September 7, 2019
Split calibration curve: an approach to avoid repeat analysis of the samples exceeding ULOQ
Sudipta Basu1, Abdul Basit, Selvan Ravindran
1Department of DMPK & Toxicology, Sai Advantium Pharma Ltd, Building 1, Plot 2, Chrysalis Enclave, International Biotech Park, Phase 2, Hinjewadi, Pune, 411057, India. basu.sudipta@gmail.com
Background:
The current practice of using calibration curves with narrow concentration ranges during bioanalysis of new chemical entities has some limitations and is time consuming. In the present study we describe a split calibration curve approach, where sample dilution and repeat analysis can be avoided without compromising the quality and integrity of the data obtained.
Results:
A split calibration curve approach is employed to determine the drug concentration in plasma samples with accuracy and precision over a wide dynamic range of approximately 0.6 to 15,000 ng/ml for dapsone and approximately 1 to 25,000 ng/ml for cyclophosphamide and glipizide. A wide dynamic range of concentrations for these three compounds was used in the current study to construct split calibration curves and was successfully validated for sample analysis in a single run.
Conclusion:
Using this method, repeat analysis of samples can be avoided. This is useful for the bioanalysis of toxicokinetic studies with wide dose ranges and studies where the sample volume is limited.
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