Mycophenolic acid estimation by pooled sampling: a novel strategy.

Area of Science:

• Pharmacology
• Clinical Chemistry
• Bioanalysis

Background:

• Mycophenolic acid (MPA) area under the curve (AUC0-6) is crucial for monitoring mycophenolate mofetil therapy.
• Accurate MPA AUC0-6 estimation traditionally requires frequent blood sampling, posing logistical and cost challenges.

Purpose of the Study:

• To evaluate the reliability of estimating MPA AUC0-6 by pooling blood samples from multiple time points.
• To determine if a simplified sampling strategy can maintain accuracy in MPA AUC0-6 determination.

Main Methods:

• Eighty 6-hour pharmacokinetic profiles were analyzed from patients on mycophenolate mofetil.
• Blood samples were pooled into two sets, and MPA AUC0-6 was calculated using a two-rectangle method.
• Linear correlation, intraclass correlation, bias, and precision were assessed against traditional methods.

Main Results:

• Pooling 10 samples into two demonstrated high accuracy, with linear correlation (r) of 0.982 and intraclass correlation of 0.979.
• Significant correlations were observed for MPA AUC0-3 (r=0.978) and MPA AUC3-6.
• The pooled method showed a mean bias of -6.4% and precision of 7.37% for MPA AUC0-6.

Conclusions:

• Pooling 10 samples into two provides a highly accurate and reliable method for estimating MPA AUC0-6.
• This approach reduces sample transportation and increases laboratory throughput, leading to cost savings.
• The method is particularly valuable for large-scale bioavailability studies, including those in diverse ethnic populations.