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But if there is too little (less than 25 mIU/mL) or too much (500,000 mIU/mL or more) hCG in the urine, a urine-based pregnancy test may give a false negative. To ensure the most accurate result ...
an at-home pregnancy test can measure hCG levels with 97 to 99 percent accuracy. Pregnancy tests with blue or pink dye typically show one line if the result is negative and two if hCG is detected ...