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ARTs sold in Singapore have quite high accuracy. Between 82% to 98% sensitivity (high sensitivity means less false negatives).
The case where BOTH occasions the ART is negative suggest one is doing wrongly.
Even if you display symptoms, and the first ART is negative, just do a 2nd one a day later. Because statistically, 95% sensitivity with another 95% sensitivity means extremely low chance of false negatives.
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