Hi,
I visited USCIS office in USA and discussed with them. They said OK to go ahead for tests in India based on their website details.
Then contacted Panel doctor in India and he asked me to get approval from US Consulate
I contacted them through email and they raise case for the same. After few days, they gave confirmation for conducting tests there. I showed it to doctor. he conducted tests,prepared reports and handover the sealed envelopes for I-693
My family sent me that to US and I submitted to USCIS. Time consuming process but finally did it.