Final answer:
The proper step for a phlebotomist when a venipuncture tube does not fill is to attempt another venipuncture. If blood typing results in agglutination with both anti-A and anti-B antibodies, it indicates a normal AB positive blood type.
Step-by-step explanation:
When a phlebotomist encounters the issue of a venipuncture's second tube not filling completely, they may consider several steps to resolve the issue. A proper approach would be to first gently reposition the needle to see if the tube fills, which is not listed in the options. If this is unsuccessful, the correct step would be to perform another venipuncture. Writing 'QNS' (quantity not sufficient) on the requisition should only be done if an additional venipuncture also fails to collect enough blood for the ordered tests. Submitting the partially filled tubes could result in inadequate testing, leading to inaccurate results or the need for another blood draw. Inserting a new tube could help if the issue was with the tube itself, but not if the issue lies with the vein or the needle's position.
Regarding the blood type testing question, when both anti-A and anti-B antibodies cause agglutination, this indicates that the blood type is AB positive. This is a normal response for individuals with this blood type and no error has been made.