He also noted there has been domestic criticism of the growth figures as well.
"The government should clarify the situation not because I care for what the US has said but because there has been domestic criticism of it from certain quarters too," the senior BJP leader, who has often faulted the Modi government over its economic and foreign policies, told PTI.
Even if domestic criticism is ignored, the government should now come out with a clarification after India's "best friend" - the US - has also sounded unconvinced, he said in an apparent jibe at the Modi government.
If the discrepancies are removed, then the growth rate falls down drastically, he said.
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The NDA government has changed the criteria by which growth figures are evaluated and it has resulted in sharp upward revision of previous growth rates.
He also wondered if the Department of Statistics, which puts out the figures, was fully equipped to deal with the changes.
Sinha said when he chaired the standing committee on finance during the previous Lok Sabha, he found the department making many "bloopers" in its report.
A report produced by the Bureau of Economic and Business Affairs of the State Department said that India's 7.5 per cent growth rate may be "overstated" and the Narendra Modi government has been "slow" to match its "rhetoric" in economic reforms.
"Ostensibly, India is one of the fastest growing countries in the world, but this depressed investor sentiment suggests the approximately 7.5 per cent growth rate may be overstated," the report titled "Investment Climate Statements for 2016" said.