AMCA Urinalysis and CLIA-Waived Laboratory Testing — Questions and Answers
Question 1: Which type of urine specimen is considered the MOST concentrated and is preferred for routine urinalysis?
- Random specimen
- 24-hour collection
- First morning void (Correct answer)
- Midstream clean-catch
Correct answer: First morning void
The first morning void is the most concentrated urine specimen because solutes accumulate overnight. It provides the most reliable results for detecting abnormalities like protein, glucose, and formed elements such as casts.
Question 2: A urine dipstick test shows a positive result for nitrites. This finding MOST suggests:
- Diabetic ketoacidosis
- A urinary tract infection caused by gram-negative bacteria (Correct answer)
- Kidney stones
- Liver disease
Correct answer: A urinary tract infection caused by gram-negative bacteria
Nitrites on a dipstick indicate that bacteria (typically gram-negative organisms such as E. coli) have converted urinary nitrates to nitrites. This finding, especially combined with leukocyte esterase, is strongly suggestive of a UTI.
Question 3: Under CLIA regulations, a 'CLIA-waived' test is defined as one that:
- Requires a licensed laboratory director to perform
- Is cleared by the FDA as simple with minimal risk of error (Correct answer)
- Must be sent to a reference laboratory
- Requires annual proficiency testing by a third party
Correct answer: Is cleared by the FDA as simple with minimal risk of error
CLIA-waived tests are FDA-cleared tests deemed simple enough that the risk of error is negligible. Offices performing only waived tests must obtain a Certificate of Waiver and follow manufacturer instructions but face minimal regulatory oversight.
Question 4: A midstream clean-catch urine specimen is ordered. In what order should the medical assistant instruct the female patient to perform the collection?
- Cleanse, begin urinating, catch midstream in cup, finish urinating into toilet (Correct answer)
- Begin urinating into cup, cleanse, then finish into toilet
- Collect all urine into the cup, then cleanse afterward
- Cleanse, collect first stream into cup, discard remainder
Correct answer: Cleanse, begin urinating, catch midstream in cup, finish urinating into toilet
The correct sequence for a midstream clean-catch is: cleanse the urethral area front to back, begin voiding into the toilet to flush out urethral contaminants, then catch the midstream portion in the sterile container, and finish voiding into the toilet. This minimizes contamination.
Question 5: Urine dipstick results show a specific gravity of 1.001. This MOST likely indicates:
- Highly concentrated urine
- Normal hydration status
- Kidney failure causing retention of solutes
- Very dilute urine (Correct answer)
Correct answer: Very dilute urine
Urine specific gravity ranges from approximately 1.001 to 1.035. A value near 1.001 indicates highly dilute urine, suggesting overhydration or possible diabetes insipidus. Normal specific gravity is roughly 1.010–1.025.
Question 6: When using a urine dipstick, which step is CRITICAL to ensure accurate results?
- Dip the strip, then immediately read all pads at 30 seconds
- Compare pads to the color chart at the manufacturer-specified times for each analyte (Correct answer)
- Read all pads simultaneously at exactly 2 minutes
- Shake excess urine off the strip vigorously before reading
Correct answer: Compare pads to the color chart at the manufacturer-specified times for each analyte
Each analyte pad on a dipstick has its own specific reading time specified by the manufacturer (e.g., leukocytes at 2 minutes, glucose at 30 seconds). Reading all pads at the same time or too early/late leads to inaccurate results.
AMCA Urinalysis and CLIA-Waived Laboratory Testing
Which type of urine specimen is considered the MOST concentrated and is preferred for routine urinalysis?