In the order of draw for blood collection, which tube is filled first?

The first tube that should be filled in the order of draw for blood collection is the yellow tube, which typically contains a clot activator and is used for cultures and blood bank studies. This tube is designed to be filled first to prevent contamination and ensure accurate test results when collecting samples that require sterile conditions.

In the context of blood drawing, maintaining the correct order is crucial to avoid carryover of additives from one tube to another, which can potentially interfere with test results. The yellow tube is also key in identifying certain pathogens or antibodies without cross-contamination from other tubes that might contain or inhibit microbial growth or specific substances required for those tests.

Understanding the blood collection order helps to standardize procedures and maintain the integrity of laboratory results.