CRP increases after any infection..bacterial, viral, fungal or even chronic inflammatory conditions such as rheumatoid arthritis. It is not specific for mucormycosis (black fungus) It is just a marker to assess level of inflammation. And to monitor response to treatment. Blood culture can detect mucormycosis. However for a blood culture report to come positive it means that the infection is very severe. To accurately diagnose mucormycosis, one needs a microscopy report of samples obtained from the nose/eye/mouth or any affected part. Mucormycosis can be suspected clinically, or on MRI but confirmation is by microscopy.

For black fungus to detect u have to take specimen from the site