Ua at ER ketones 3+;sp grav 1.030;urobi 0.2;epith many. I've had severe back pain so what could this be? Dr at ER said its probaly ic flare up?

See answer. Your urinalysis suggests that you were likely somewhat dehydrated (high specific gravity 1.030); that you had not eaten in a while (3+ ketones as a result of burning fat for calories); and does not suggest uti. The small amount of urobilinogen and epithelial cells insignificant. If your main complaint was an increase in urinary symptoms, a flare-up of ic is most likely.