1. Control Line Not Present
- Issue: The control line does not appear after performing the test, making the result invalid.
- Possible Causes:
- Insufficient sample volume.
- Expired or defective test.
- Improper testing technique (e.g., not following the instructions for sample application).
- Solution:
- Double-check that you’ve used a valid (non-expired) test and applied the recommended number of sample drops.
- If the control line still fails to appear, discard the test and use a new one.
2. Faint or Blurred Test Lines
- Issue: Test lines are present but appear so faint or smeared that it’s difficult to interpret the result.
- Possible Causes:
- Inconsistent sample flow due to insufficient or excessive drops.
- Poor lighting or improper handling of the test strip.
- The sample may have contaminants or the test was moved excessively before the lines fully developed.
- Solution:
- Use the exact recommended number of drops.
- Place the test on a flat, level surface and wait the full recommended time before reading the result.
- Ensure you’re in a well-lit area to interpret the lines clearly.
3. Improper Storage & Handling
- Issue: The test kit may fail to function correctly if exposed to extreme temperatures or humidity.
- Possible Causes:
- Leaving kits in a car on a hot or cold day.
- Storing in a bathroom or another high-humidity environment.
- Opening the package too far in advance of testing, allowing moisture or contaminants to reach the strip.
- Solution:
- Keep the tests in a cool, dry place as indicated on the packaging.
- Store them in their original, sealed packaging until ready to use.
- Check product information for the recommended temperature range.
4. Sample Collection Errors
- Issue: The sample (urine or otherwise) might be collected incorrectly, leading to invalid or inaccurate results.
- Possible Causes:
- Using a contaminated container or not following sanitary guidelines.
- Collecting a sample at the wrong time (e.g., for certain tests, a first-morning sample may be recommended).
- Spilling or mixing samples.
- Solution:
- Follow the instructions for sample collection meticulously (e.g., using a clean container, collecting at the right time of day).
- Avoid touching the test strip or letting it come into contact with surfaces before use.
- Discard any questionable sample and collect a fresh one if contamination is suspected.
