How to validate NTLM hash

I am working on a peculiar use case where I receive NTLM hash value as input. After validating the input i have to do some business operation. What are the simple ways to validate the NTLM hash value(I don't need to do all the encryption to validate the input). I am able to validate using the length. but looking for other options possible options.

For Example,

unsigned char* inputbuffer = < NTLM HASH Value>

if ( inputbuffer is an NTLM hash)
{
  //business logic
}