Which statement about the role of internal controls in pregnancy screening kits is true?

Which statement about the role of internal controls in pregnancy screening kits is true?

• A. They detect hCG directly.
• B. They require a random urine specimen.
• C. They assess whether the specimen was collected correctly.
• D. They replace the need for external quality control.

Answer: (C)

Internal controls are built-in checks that ensure the test has run properly and that the specimen has been applied and migrated through the test correctly. The control line appearing indicates the device functioned as intended; if the control line is absent, the result is invalid, which helps confirm that a negative or positive hCG reading is trustworthy only when the control signal is present. This is why the statement about assessing whether the specimen was collected correctly best describes the role of the internal control. It does not detect hCG itself—that’s what the test line does. It also does not replace external quality control, and specimen-type requirements (random versus first-morning urine) are separate considerations for test sensitivity and instructions.

Internal controls are built-in checks that ensure the test has run properly and that the specimen has been applied and migrated through the test correctly. The control line appearing indicates the device functioned as intended; if the control line is absent, the result is invalid, which helps confirm that a negative or positive hCG reading is trustworthy only when the control signal is present. This is why the statement about assessing whether the specimen was collected correctly best describes the role of the internal control. It does not detect hCG itself—that’s what the test line does. It also does not replace external quality control, and specimen-type requirements (random versus first-morning urine) are separate considerations for test sensitivity and instructions.