Not graded
Sunan ad-Darimi 902
أَخْبَرَنَا إِسْحَقُ بْنُ عِيسَى أَخْبَرَنَا هُشَيْمٌ عَنْ يُونُسَ عَنْ الْحَسَنِ قَالَ الْمُسْتَحَاضَةُ تَعْتَدُّ بِالْأَقْرَاءِ
This hadith has no English translation yet: the Arabic text, the reference and the grade are shown here.
Reported by Ad-Darimi (No. 902).