A beta hcg value of 1.2 ng/ml is equal to exactly 18 mIU. The formula for conversion is 1 ng/ml = 15 mIU. Most hospital blood tests actually test in ng/ml, which confuses some people since the values seem so low prior to conversion. The ELISA radioimmunoassay test (the most popular US/UK hospital hcg test series) gives results in ng/ml only. Most doctors and nurses do not convert the values for their patients unless specifically asked to..
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