CNA CNA Medical Lab and Specimen Collection Skills 1

Question 1

When collecting a clean-catch midstream urine specimen, what is the correct sequence of steps?

Accepted Answer

Void first portion, collect midstream, then finish voiding into toilet

Answer

Collect the first portion of urine stream into the specimen cup

Answer

Collect the entire voiding into the specimen cup

Answer

Collect the last portion of urine stream into the specimen cup

Question 2

A patient requires a 24-hour urine collection. What should the CNA do at the START of the collection period?

Accepted Answer

Discard the patient's first voiding, then begin collecting all subsequent voidings

Answer

Collect the patient's first voiding into the 24-hour container

Answer

Ask the patient to void, collect it, and note the start time

Answer

Begin collecting urine at exactly midnight regardless of the patient's voiding schedule

Question 3

When collecting a urine specimen from a patient with an indwelling Foley catheter, where should the CNA obtain the sample?

Accepted Answer

From the drainage port on the catheter tubing using a sterile syringe

Answer

By disconnecting the catheter from the drainage bag and draining into a cup

Answer

Directly from the urine drainage bag

Answer

By removing and reinserting the catheter

Question 4

A patient needs a stool specimen for occult blood testing. What food should the patient avoid before this test?

Accepted Answer

Red meat, raw vegetables, and aspirin

Answer

Dairy products and eggs

Answer

Citrus fruits and juices

Answer

Caffeinated beverages and chocolate

Question 5

When collecting a stool specimen, how much stool is typically required?

Accepted Answer

About the size of a walnut (1-2 tablespoons)

Answer

An entire bowel movement

Answer

Just a small smear on the collection card

Answer

A full specimen cup

Question 6

A patient needs a sputum specimen for culture. When is the best time to collect this specimen?

Accepted Answer

First thing in the morning before eating or drinking

Answer

After the patient eats a large meal

Answer

In the afternoon when the patient has been active

Answer

At bedtime after the patient has been resting all day