Yes! We have two kinds of MUAC which are used to identify nutrition status: One for children between 6-59 months and another for mothers.

Hi there
I know you are not necessarily looking for MUAC in pregnant women, however this article might help you :
http://currents.plos.org/disasters/article/which-anthropometric-indicators-identify-a-pregnant-woman-as-acutely-malnourished-and-predict-adverse-birth-outcomes-in-the-humanitarian-context/
Also, what do you mean exactly with maternal ? Women of reproductive age?
good luck, mija