Would another FUE help fill in density after first hair transplant?

You could very well have lost more hair due to further male pattern hairloss. It has been 2 years that has passed. Dr. Rassman below said to wait another 8 months. Not in my opinion. Go to a reputable clinic and get an evaluation for your options.

Greetings,Density is one of the most critical factors after hair transplantation.  Early on you may not be able to fully determine your density.  Density depends on various factors including the number of hairs  per cm squared, the thickness and vibrancy of hair, direction and design of hair.  Techniques for density vary from surgeon to surgeon.  In my office, we utilize a specialized technique that allows for optimizing density and found it to be helpful.  
Best,
Dr. Anil Shah

It would be in your interest to see your doctor for a follow up exam to assess if another surgery would fulfill your goals and expectations.

Generally at age 46 your hair loss should be fairly stable.  At times patients need a 2nd fue procedure to add density and obtain a more natural result.  We generally recommend 9-12 months before having a 2nd procedure.

Many people get a second FUE procedure to touch up areas they may not be satisfied with following their first FUE procedure. If you have sufficient donor hair (as determined from an in person consultation, not just from it looking full) then there's absolutely no problem with having another transplant.

Hello db70

If your donor area allows it, I will just say GO FOR IT. 

A second transplant can add density for sure. Also, make sure to combine your transplant with a non-surgical treatment such as PRP, Propecia, Laser therapy, etc. In order to prevent further hair loss or thinning. Schedule a consultation with a Hair Doctor and talk about your goal so that together you can define the proper treatment plan.

If your donor area is still eligible for the extraction , you may go a head with a  second Fue procedure to increase the density . Good luck 

It would be helpful if you could post a few photos of your current hair situation.A great first step would be an online consultation which normally includes a graft amount and pricing information. Often you can submit photos to top hair restoration surgeons for a complimentary evaluation. This should help lead you in the right direction. 

It is common to perform multiple procedures of hair transplant over one's lifetime. Touch ups are often needed as well as further restoration for large graft sessions that need to be spaced into 2 separate procedures. In addition to repeat FUE transplant procedure it is very reasonable to consider medications and PRP to address hair thinning.

Many people with one FUE would want a repeat FUE if the density is inadequate. Wait at least 8 months to determine this