One commercially available test, PreTRM, based on the ratio of insulin-like growth factor-binding protein 4 (IBP4) and sex hormone-binding globulin (SHBG) in maternal serum, uses mid-gestation samples, between 18 and 20 6/7 weeks of gestation (126146 days), to estimate sPTB risk
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That means there are no standardized, official dosing guidelines for obesity outcomes, and products sold in the market may not meet pharmaceutical-level quality controls