Last week, Middle East Concern said it was worried about the wellbeing of Maryam Naghash Zargaran and called on Christians to pray for her.
She's currently serving a four year sentence, which began in July 2013, for her work on an orphanage with former Christian prisoner Saeed Abedini (pictured). She was charged with "acting against national security".
The Muslim convert has a history of heart problems and is said to be suffering with pain in her ears and severe headaches. It was reported the authorities at Evin Prison in Tehran were not recognising the severity of her condition.
She'd gone on hunger strike as a protest against the lack of medical care for her.
It is reported that permission was granted for Maryam to leave prison on medical furlough over the weekend but was only released on Monday.
Middle East Concern is asking Christians to pray that, "Maryam will receive proper treatment, and will be restored to good health. That the Lord will bless Maryam and her family during this time they will have together. That Maryam will be fully released from prison soon and God will move the Iranian authorities and officials to love mercy and act justly."