A phlebotomist should verify that a patient has fasted for how long prior to obtaining a fasting specimen?

Choice A reason:
Asking another phlebotomist to obtain the specimen is a prudent step after multiple unsuccessful attempts. It can reduce the patient's discomfort and anxiety. A fresh perspective from another professional might increase the chances of a successful draw, especially in challenging situations like small, fragile veins often found in diabetic patients.

Choice B reason:
Performing the draw on a foot is not typically recommended due to the increased risk of infection and complications, especially in diabetic patients who may have reduced sensation and slower healing in their extremities. This option should only be considered when other more proximal sites have been deemed unsuitable.

Choice C reason:
Repeating the draws until successful is not advisable as it can cause undue stress to the patient and increase the risk of hematoma or vein damage. It is essential to minimize the number of attempts to prevent patient discomfort and potential complications.

Choice D reason:
Performing the draw on a leg is another option that is generally avoided unless absolutely necessary, due to similar reasons as drawing from a foot—risk of infection and complications. Additionally, it can be an uncomfortable position for the patient.

Choice A Reason:
The age of the newborn is important for certain metabolic screenings, as some metabolites may not be present or at measurable levels immediately after birth. However, the requirement for the newborn to be at least 3 days old is not a standard for all blood spot collections for inborn errors of metabolism (IEM). Some screenings are performed within 24 to 48 hours after birth.

Choice B Reason:
While it is important that the circles on the filter paper are adequately filled to ensure there is enough blood for the test, the requirement for them to be at least half filled is not specified in the guidelines. The focus is usually on ensuring the blood spot is of the right size and properly saturated through the filter paper.

Choice C Reason:
The inclusion of the first drop of blood is not typically a requirement. In fact, the first drop is often wiped away to avoid contamination with tissue fluids that could affect the test results. Subsequent drops are used to fill the circles on the filter paper.

Choice D Reason:
The specimen must be completely dried before the test can be processed to prevent degradation or hemolysis of the blood sample. This is a critical step in the preparation of the sample for accurate testing of IEM. The drying process helps preserve the integrity of the metabolites to be analyzed.