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GCSE Biology · key term
The region that shows whether liquid has travelled through the strip and the test has operated correctly.
Used by Edexcel and OCR
Specification 5.22B · Paper 1
Revise: Monoclonal Antibodies in Pregnancy TestingA separate control line should still appear. It shows that urine has moved along the strip and that the test reagents have operated. A test line indicates detected hCG only when the control shows that the test is valid.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
A part of a test strip that indicates whether the sample has moved through the strip and the test has operated correctly.
Distinguish the test line from the control line: the test line indicates detected hCG, while the control line shows that the test has operated correctly.
On a test strip, distinguish the test line from the control line. A control line shows that the test has worked; it does not by itself show that the target molecule is present.
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A separate control line captures spare labelled antibodies and shows that the liquid has travelled through the strip and the test has operated correctly. The result must be interpreted using both lines: the control line confirms that the test is valid, while the test line reports whether the target was detected.