ABP Operating Guidelines  – Version 9.0 – July 2023  Page 43/91 For initial quantification:  • the Aliquot  may be analyzed immediately after aliquoting;  or  • the Aliquot  shall be stored at approximately 4  °C°C if analyzed within 24h (within a maximum of five (5) days from Sample  collection);  or • the Aliquot  shall be frozen (-20°C ) if the analysis will be conducted more than 24h after aliquoting.