Shown below is an RDT test. This uses a pan-malarial antibody (labelled Pan) and a P.falciparum species-specific antibody (labelled Sp). The test has been used to assess a patient and the positive bands are shown on the figure.
Explanation of correct answer (click "Expand")
'Short answer taken from section "Multi-line RDT Interpretation" (see the section for full details and links).
When no band appears in the control area (black arrow) the test is ALWAYS invalid:
Irrespective of whether any other bands are present, this is always an invalid test: do not interpret. Report as failed test Action: