Will the Use of Lyophilized Citrate Tubes Lead to the Over-Diagnosis of Diabetes in Pregnancy?

contact with LDPE. Because of limitations of available leftover patient urine volume, analysis time, and cost, we only performed singlicate experiments, which demonstrated that the THC-COOH concentrations in the inverted, metal lid containers of urine specimens varied by −50% to +9% from their plastic-only counterparts. When averaged, a reduction of 29% was observed. Specimens collected and stored in these containers could potentially yield falsely low THC-COOH results. We caution the adoption of new specimen containers until they are investigated on all subjected analytes.