Why Human Plasma Is the Most Critical Raw Material Decision in IVD Development

In the development of in vitro diagnostics (IVD), the quality of human biological source material determines whether an assay succeeds or fails. Human plasma and serum form the biological matrix in which analytes are detected, biomarkers are quantified, and controls are calibrated. Inconsistent or poorly documented source material leads to validation problems, ring trial outliers, and regulatory queries — ultimately costing far more than any initial procurement saving.

SeamlessBio supplies human plasma and serum for IVD development and quality assurance across a broad scale spectrum: from small single donations for early feasibility work to bulk material for the serial production of controls and standards.

Normal Donations: The Foundation for Assay Development and Calibrators

Normal donations — defined according to German transfusion law — are the standard material for assay development, calibrator construction, and the preparation of external quality assessment (EQA) samples. Their critical quality parameters are:

• Native composition: No additives, no reconstituted matrices — genuine native human material with physiological protein composition
• Complete documentation: Titre, volume, matrix, shelf life, test kit and test manufacturer — for individual donations additionally age, gender of the donor, and the measured laboratory result
• Defined anticoagulation: EDTA, citrate, heparin, or serum (off-the-clot) — matched to the downstream requirements of your assay
• Scalability: Identical material from the development pilot to serial production

For early assay development and feasibility studies, small volumes (1–10 ml) enable rapid screening rounds without consuming the budget reserved for actual product development. For calibrator manufacturing, pool construction, and serial quality control, large volumes and bulk material are available.

Pooled Human Plasma: Homogeneity for Controls and Standards

Multi-donor pools from normal donations are the preferred material for manufacturing quality controls and internal standards. By blending multiple individual donors, biological variability is reduced, resulting in higher lot-to-lot consistency. This is particularly relevant for IVD manufacturers who deploy controls under ISO 13485 in routine production: only homogeneous pool material delivers reproducible control values across multiple production lots.

Pooled human plasma and serum is available in a range of volumes — from 10 ml for initial evaluations to 500 ml and beyond for production-scale use.

Disease State Samples: For Sensitivity and Specificity Studies

The clinical performance evaluation of an IVD under IVDR 2017/746 requires the use of well-characterised disease state samples. Sensitivity studies require samples from patients with