I had been looking for a research internship to do over the summer and perhaps continue into the school year, so I emailed professors at a nearby university whose research interested me and one (I really love his projects) responded saying that he was considering hosting a HS student in his lab and asked for a HS transcript, resume, and an essay explaining why I wanted to work with him. The only problem is that his lab focuses on polymer chemistry; when I took chemistry honors last year, I received a B (86) which is on my transcript. The grade was as low as it was due to major health problems that led to me to being absent for a large part of the first semester and although my grades improved in the second semester, they were not enough to raise my grade to an A. However, when I took the chemistry regents exam (NY, on my transcript) and chemistry SAT II in June I received a 96 and 770. Would those scores make up for my subpar grade in chem honors? Should I (and if so, how) mention the medical issues/absences that affected my grade? Any help would be appreciated, thanks.
Since you are truly interested in working in his lab, I would say submit everything. If you write a really passionate essay, he will probably overlook the grade. Chemistry isn’t the easiest thing in the world. Passion beats everything!!
@sprights thanks for your response! 
anyone else?
bump
Also although he didn’t specify that I should include my SAT score, he recommended that I put standardized test scores on the resume I send him (so I mentioned SAT II and AP scores). I got a 2190 on the November test, but plan to retake in January. Would mentioning the 2190 hurt me?
2190 would not hurt you at all