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Table 1 Conversion of oxytocin levels between units

From: Maternal plasma levels of oxytocin during physiological childbirth – a systematic review with implications for uterine contractions and central actions of oxytocin

Conversion of different size units:
 1 Unit (IU) = 1000 milliunits (mU) = 1000,000 microunits (μU)
 1 g (g) = 1000 mg (mg) = 1000,000 micrograms (μg) = 1000,000,000 nanograms (ng) = 1000,000,000,000 picograms (pg)
 1 Mol/L = 1 Molar (M) = 1000 milliMolar (mM) = 1000,000 microMolar (μM) = 1000,000,000 nanoMolar (nM) = 1000,000,000,000 picoMolar (pM)
Conversion of units (U) to weight units:
 1 IU = 1.67 μg, 1 μg = 0.60 U
 1 mU = 1.67 ng, 1 ng = 0.60 mU
 1 μU = 1.67 pg, 1 pg = 0.60 μU
Conversion of weight/volume of oxytocin to Molarity (molecular weight of oxytocin equal to 1007 g/mol):
 1 g/mL = 1 mol/L = 1 M
 1 mg/mL = 1 mmol/L = 1 mM
 1 μg /mL = 1 μmol/L = 1 μM
 1 ng/mL = 1 nmol/L = 1 nM
 1 pg/mL = 1 pmol/L = 1pM