Which of the following tests can be run using a light blue collection tube?

A. Instruct the patient to collect the specimen and return it to the laboratory: For a valid drug screening, the specimen should be collected in the presence of a medical professional to prevent tampering.
B. Measure and record the temperature of the specimen: Measuring and recording the temperature of the urine specimen is important to ensure that the sample is fresh and has not been tampered with or substituted.
C. Pre-label the specimen container prior to collection: The container should be labeled after the specimen is collected to avoid mix-ups and to ensure accurate tracking.
D. Have the patient begin collecting the specimen mid-stream: The specimen for drug testing should typically be collected as a first-morning or a mid-stream sample to ensure accuracy, but this can vary based on specific protocols.

A. "This test measures my estrogen serum ratio after menopause." ESR stands for erythrocyte sedimentation rate, not estrogen serum ratio. This is an incorrect interpretation of the test.
B. "This test measures the fluctuation of serum protein." The ESR does not directly measure serum protein levels. It measures the rate at which red blood cells sediment in a period of one hour.
C. "This test measures my hemoglobin levels." Hemoglobin levels are measured by a hemoglobin test, not an ESR. This statement is incorrect.
D. "This test measures the distance my RBCs have dropped." This is the correct understanding. ESR measures the rate at which red blood cells settle at the bottom of a test tube over a specified period, indicating the distance the RBCs have dropped.