Lets start on terminology so we are talking grapefruit to grapefruit. 
Only Tables have fields.
Forms have controls.
Forms can be unbound or bound. If a Form is unbound, it has unbound controls. If a form is bound, it has a record source of a table or query.
A bound Form can have unbound or bound controls. A bound control is tied (bound) to a field in the form record source.
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It sounds like you want to make a search form. There are many ways to do this. Here is one.
Setting a filter
Lets say you have a form "frmTests" that has a record source of "qrySampleStatus".
This is a simple query that is something like
Code:
SELECT tblPatients.PatientID_PK, tblPatients.PatientName, tblTests.*
FROM tblPatients INNER JOIN tblTests ON tblPatients.PatientID_PK = tblTests.PatientID_FK;
In this case, "PatientID_FK" is a foreign key to the patient table and is a Long Integer.
The form Default View is set to Continuous Forms view.
You open the form and every record is displayed.
Now you add some unbound controls in the form header.
You add 4 text boxes and 2 combo boxes. The text boxes you rename: "tbPatientID" (tb = text box), "tbReceivedSampleDate", "tbCGACollectionDate" and "tbSampleID".
The combo boxes you rename: "cboPatientName" and "cboPhysicianName".
And you add a button to execute the code. An example of the button click code is at http://www.allenbrowne.com/ser-62code.html
(You will have to modify the code for your table and control names.)
So you enter the search criteria you want, then click the button. The records that match the criteria are displayed, if any.
You can add another button to remove the filter. The code for that is simple:
Code:
Me.Filter = ""
Me.FilterOn = False
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Limiting records returned
Another option is to use criteria to limit records returned. You would use an unbound form with unbound controls and the same code except it wouldn't set a filter. It would be a string variable like "strWhere" that would be used in a line like:
Code:
DoCmd.OpenForm "frmSearchSampleStatus", acNormal, , sWhere