Malaria Rapid Antigen Test, Whole Blood — Invalid Control Result
This is an invalid-control result from a rapid blood test for malaria. The test cannot be interpreted and should be repeated with a new sample.
["An invalid control means the malaria test did not work properly, so the result is neither positive nor negative and must be repeated."]
Key facts at a glance
- LOINC
- 99609-0
- Short code
- MRA TA W contr IV
- Synonyms
- MRA TA W contr IV
- Category
- liver
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- mr-angio
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What is this test?
A malaria rapid antigen test checks a small blood sample for proteins made by Plasmodium parasites. A control line shows that the test strip worked correctly; an invalid-control result means that this check failed.
Why might I need this test?
This test may be used to evaluate unexplained fever or other symptoms in someone who has traveled to or lived in an area where malaria occurs. It can help clinicians decide whether additional blood testing or treatment is needed.
How is the test performed?
A few drops of whole blood are placed on a rapid-test cartridge, and colored lines appear within the specified reading time. If the required control line does not appear, the result is invalid even if a test line is present, and a new test should be performed.
How do I prepare for the test?
Fasting is generally not required, but follow the instructions provided by the laboratory or clinic. Tell the care team about recent travel to malaria-endemic areas, prior malaria treatment, and any medications you are taking.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
An invalid control is not a positive or negative malaria result. It usually indicates that the test strip did not function correctly or that the sample was not applied properly, so the test should be repeated with a new sample. A clinician should interpret the repeat result together with symptoms, travel history, and other malaria tests when needed.
Short name
Malaria rapid test — invalid control
Frequently asked questions
What does an invalid malaria rapid-test control mean?
Does an invalid result rule out malaria?
What should I do after an invalid result?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy