CMLA Specimen Collection & Handling 3

Question 1

Which of the following best describes the proper technique for mixing an EDTA tube after collection?

Accepted Answer

Invert gently 8–10 times

Answer

EDTA tubes should be gently inverted 8–10 times to thoroughly mix the anticoagulant with blood without causing hemolysis.

Question 2

A urine specimen for culture must be collected using which method to avoid contamination?

Accepted Answer

Midstream clean-catch into a sterile cup

Answer

Midstream clean-catch technique minimizes urethral flora contamination for accurate urine culture results.

Question 3

Which specimen type is collected in a yellow (ACD) tube?

Accepted Answer

Whole blood for blood banking and HLA typing

Answer

Yellow ACD (acid citrate dextrose) tubes are used for whole blood specimens in blood banking, HLA phenotyping, and paternity testing.

Question 4

A specimen labeled 'STAT' is received in the lab 45 minutes after collection with no temperature notation. What should the laboratory assistant do?

Accepted Answer

Check for visible hemolysis and contact the ordering unit

Answer

The assistant should assess the specimen for hemolysis or other integrity issues and contact the ordering unit to clarify handling before processing.

Question 5

What is the minimum volume typically required in a sodium citrate tube to maintain the correct blood-to-anticoagulant ratio?

Accepted Answer

At least 90% of the stated tube volume (no more than 10% underfilled)

Answer

Sodium citrate tubes must be filled to at least 90% of capacity to maintain the 9:1 blood-to-anticoagulant ratio required for valid coagulation testing.

(CMLA) Certified Medical Laboratory Assistant Practice Test

(CMLA) Certified Medical Laboratory Assistant Practice Test

CMLA Specimen Collection & Handling 3