A new range of highly discriminatory DRVVT positive control plasmas in the critical borderline lupus positive range. The Just Positive™ DRVVT control plasmas are artificially prepared by treating normal plasma with suitable reagents. This unique production process enables lupus positive controls of any strength to be produced in large volumes and with minimal batch-to-batch variation.

Since commercial DRVVT kits vary in sensitivity a range of kit specific plasmas are available with plasmas custom made to give a borderline positive result with most of the commercial DRVVT kits available in the UK.

Each control is supplied with a table of expected clotting times for both screening and confirmatory reagents together with DRVVT ratios and normalised ratios to the companion normal plasma, Just Positive™ Reference plasma.

An example of a batch table for Just Positive™ DRVVT control for American Diagnostica is shown below.