Not a medical diagnosis

If a result matters to you, see a doctor

Whether the reading is positive, negative, or inconclusive: a qualified healthcare professional can confirm pregnancy with a blood test (hCG quantitative), an ultrasound, and a clinical history that no photograph can capture. Please consult one.

If you are in distress or if a result is unexpected and you need to talk to someone, contact a local women's health line or your primary care provider. We are not able to provide clinical advice.

What can affect a reading

At-home tests vary by brand, dye chemistry, sensitivity threshold, and the conditions under which the photograph was taken. The following commonly affect what the model sees:

• Lighting — yellow indoor light, glare, and harsh shadows can wash out faint lines or invent lines that are not there.
• Test brand & format — different tests place control and result lines in different positions, with different dye colours and intensity scales.
• Faded lines — very early pregnancies can produce extremely faint test lines that humans and models alike struggle to call confidently.
• Evaporation lines— tests read outside the manufacturer's time window can show grey, colourless lines that are not true positives.
• Photo angle, focus, and resolution — out-of-focus or off-axis shots reduce confidence.
• Medications & conditions — certain fertility treatments (hCG injections), gestational trophoblastic disease, and some medications can produce misleading results regardless of how the test is read.

Confidence is an estimate, not a guarantee

The percentage we display is an internal model confidence. It is not a clinical accuracy figure and it is not directly comparable to the sensitivity / specificity numbers manufacturers publish for the test itself. Treat low-confidence readings as a prompt to re-test, follow the manufacturer's instructions carefully, and consult a clinician.

FDA & equivalent regulators

istPositive is offered as a general-wellness aid for personal use. It is not cleared, approved, or registered as a medical device by the FDA, the EMA, the MHRA, or any other regulator. It does not diagnose, cure, mitigate, treat, or prevent any disease or condition.

In an emergency

If you are experiencing severe abdominal pain, heavy bleeding, fainting, or any other medical emergency, do not use this app. Call your local emergency number immediately.

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